diff --git a/pyproject.toml b/pyproject.toml
index 884a32ef..9957a3b6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -134,7 +134,6 @@ ignore = [
     "D203",  # incompatible with D204
     "D213",  # incompatible with D212
     "D400",  # A stricter version of #415 that doesn't allow !
-    "ANN204", # Requrite type hints for
     "ANN401", # Disalows Any, Any is needed at times, Once MyPy is running Any will be
               # handled appropriately
 ]
diff --git a/src/openflexure_microscope_server/background_detect.py b/src/openflexure_microscope_server/background_detect.py
index d9e39e15..d9e44cfc 100644
--- a/src/openflexure_microscope_server/background_detect.py
+++ b/src/openflexure_microscope_server/background_detect.py
@@ -55,7 +55,7 @@ class BackgroundDetectAlgorithm:
     settings_data_model: BaseModel = BaseModel
     """The data model of algorithm settings. This must be set by child classes"""
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialise the algorithm settings."""
         try:
             self._settings: BaseModel = self.settings_data_model()
diff --git a/src/openflexure_microscope_server/logging.py b/src/openflexure_microscope_server/logging.py
index b1b5074b..0dd3ee12 100644
--- a/src/openflexure_microscope_server/logging.py
+++ b/src/openflexure_microscope_server/logging.py
@@ -120,7 +120,7 @@ class OFMLogFileFormatter(logging.Formatter):
 class OFMHandler(logging.Handler):
     """A logging.Handler that stores the most recent logs for access by the server."""
 
-    def __init__(self, level: int = logging.INFO, max_logs: int = 250):
+    def __init__(self, level: int = logging.INFO, max_logs: int = 250) -> None:
         """Initialise the handler with a set logging level and message buffer size.
 
         :param level: The level of logs captured. As standard logs of INFO and above
diff --git a/src/openflexure_microscope_server/scan_directories.py b/src/openflexure_microscope_server/scan_directories.py
index f34c0836..8256f414 100644
--- a/src/openflexure_microscope_server/scan_directories.py
+++ b/src/openflexure_microscope_server/scan_directories.py
@@ -167,7 +167,7 @@ class ScanDirectoryManager:
 
     _base_scan_dir: str
 
-    def __init__(self, base_scan_dir: str):
+    def __init__(self, base_scan_dir: str) -> None:
         """Initialise the scan directory manager.
 
         :param base_scan_dir: Path of the directory that holds all scans.
@@ -374,7 +374,7 @@ class ScanDirectory:
     _name: str
     _base_scan_dir: str
 
-    def __init__(self, name: str, base_scan_dir: str):
+    def __init__(self, name: str, base_scan_dir: str) -> None:
         """Initialise the scan directory.
 
         :param name: the name of the scan (the scan directory basename).
diff --git a/src/openflexure_microscope_server/scan_planners.py b/src/openflexure_microscope_server/scan_planners.py
index 67efbf65..7682443c 100644
--- a/src/openflexure_microscope_server/scan_planners.py
+++ b/src/openflexure_microscope_server/scan_planners.py
@@ -80,7 +80,7 @@ class ScanPlanner:
 
     def __init__(
         self, initial_position: XYPos, planner_settings: Optional[dict] = None
-    ):
+    ) -> None:
         """Set up lists for the path planning, and scan history."""
         self._initial_position = enforce_xy_tuple(initial_position)
         self._parse(planner_settings)
diff --git a/src/openflexure_microscope_server/stitching.py b/src/openflexure_microscope_server/stitching.py
index f8754425..c81bd34d 100644
--- a/src/openflexure_microscope_server/stitching.py
+++ b/src/openflexure_microscope_server/stitching.py
@@ -59,7 +59,9 @@ class BaseStitcher:
     complete.
     """
 
-    def __init__(self, images_dir: str, *, overlap: float, correlation_resize: float):
+    def __init__(
+        self, images_dir: str, *, overlap: float, correlation_resize: float
+    ) -> None:
         """Initialise a stitcher.
 
         All args except images_dir are positional only.
@@ -128,7 +130,9 @@ class PreviewStitcher(BaseStitcher):
     one preview must finish before another can be started.
     """
 
-    def __init__(self, images_dir: str, *, overlap: float, correlation_resize: float):
+    def __init__(
+        self, images_dir: str, *, overlap: float, correlation_resize: float
+    ) -> None:
         """Initialise a preview stitcher.
 
         All args except images_dir are positional only.
@@ -192,7 +196,7 @@ class FinalStitcher(BaseStitcher):
         correlation_resize: Optional[float] = None,
         stitch_tiff: bool = False,
         scan_data_dict: Optional[dict[str, Any]] = None,
-    ):
+    ) -> None:
         """Initialise a final stitcher, this has more args than the base class.
 
         All args except images_dir are positional only.
diff --git a/src/openflexure_microscope_server/things/autofocus.py b/src/openflexure_microscope_server/things/autofocus.py
index ca1adfcd..e0b956f1 100644
--- a/src/openflexure_microscope_server/things/autofocus.py
+++ b/src/openflexure_microscope_server/things/autofocus.py
@@ -215,7 +215,9 @@ class JPEGSharpnessMonitor:
     SharpnessMonitorDep as an argument is called.
     """
 
-    def __init__(self, stage: Stage, camera: RawCamera, portal: lt.deps.BlockingPortal):
+    def __init__(
+        self, stage: Stage, camera: RawCamera, portal: lt.deps.BlockingPortal
+    ) -> None:
         """Initialise a new JPEGSharpnessMonitor. The args are injected automatically.
 
         :param stage: A direct_thing_client dependency for the the microscope stage.
diff --git a/src/openflexure_microscope_server/things/camera/__init__.py b/src/openflexure_microscope_server/things/camera/__init__.py
index e5e171e0..ace9d74c 100644
--- a/src/openflexure_microscope_server/things/camera/__init__.py
+++ b/src/openflexure_microscope_server/things/camera/__init__.py
@@ -69,7 +69,7 @@ class CameraMemoryBuffer:
 
     _storage: dict[int, tuple[Any, Optional[dict]]]
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Create the buffer instance."""
         # This dictionary is the main store for data. Dictionaries are ordered since
         # Python 3.6, so the order in the dictionary is the capture order
@@ -170,7 +170,7 @@ class BaseCamera(lt.Thing):
     lores_mjpeg_stream = lt.outputs.MJPEGStreamDescriptor()
     _memory_buffer = CameraMemoryBuffer()
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialise the base camera, this creates the background detectors.
 
         This must be run by all child camera classes.
diff --git a/src/openflexure_microscope_server/things/camera/opencv.py b/src/openflexure_microscope_server/things/camera/opencv.py
index 763096e5..c159ce41 100644
--- a/src/openflexure_microscope_server/things/camera/opencv.py
+++ b/src/openflexure_microscope_server/things/camera/opencv.py
@@ -25,7 +25,7 @@ from . import BaseCamera
 class OpenCVCamera(BaseCamera):
     """A Thing that provides and interface to an OpenCV Camera."""
 
-    def __init__(self, camera_index: int = 0):
+    def __init__(self, camera_index: int = 0) -> None:
         """Iniatilise the thing storing the index of the camera to use.
 
         :param camera_index: The index of the camera to use for the microscope.
@@ -35,7 +35,7 @@ class OpenCVCamera(BaseCamera):
         self._capture_thread: Optional[Thread] = None
         self._capture_enabled = False
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         """Start the capture thread when the Thing context manager is opened."""
         self.cap = cv2.VideoCapture(self.camera_index)
         self._capture_enabled = True
@@ -48,7 +48,7 @@ class OpenCVCamera(BaseCamera):
         _exc_type: type[BaseException],
         _exc_value: Optional[BaseException],
         _traceback: Optional[TracebackType],
-    ):
+    ) -> None:
         """Release the camera when the Thing context manager is closed.
 
         Before releasing the camera the capture thread is closed.
diff --git a/src/openflexure_microscope_server/things/camera/picamera.py b/src/openflexure_microscope_server/things/camera/picamera.py
index 4ff2844d..e8ab2e2f 100644
--- a/src/openflexure_microscope_server/things/camera/picamera.py
+++ b/src/openflexure_microscope_server/things/camera/picamera.py
@@ -53,7 +53,9 @@ class MissingCalibrationError(RuntimeError):
 class PicameraStreamOutput(Output):
     """An Output class that sends frames to a stream."""
 
-    def __init__(self, stream: lt.outputs.MJPEGStream, portal: lt.deps.BlockingPortal):
+    def __init__(
+        self, stream: lt.outputs.MJPEGStream, portal: lt.deps.BlockingPortal
+    ) -> None:
         """Create an output that puts frames in an MJPEGStream.
 
         We need to pass the stream object, and also the blocking portal, because
@@ -126,7 +128,7 @@ class StreamingPiCamera2(BaseCamera):
     generalisation.
     """
 
-    def __init__(self, camera_num: int = 0):
+    def __init__(self, camera_num: int = 0) -> None:
         """Initialise the camera with the given camera number.
 
         This makes no connection to the camera (except to get the default tuning file).
@@ -384,7 +386,7 @@ class StreamingPiCamera2(BaseCamera):
             )
         self._picamera_lock = RLock()
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         """Start streaming when the Thing context manager is opened.
 
         This opens the picamera connection, initialises the camera, sets the
@@ -430,7 +432,7 @@ class StreamingPiCamera2(BaseCamera):
         _exc_type: type[BaseException],
         _exc_value: Optional[BaseException],
         _traceback: Optional[TracebackType],
-    ):
+    ) -> None:
         """Close the picamera connection when the Thing context manager is closed."""
         self.stop_streaming()
         with self._streaming_picamera() as cam:
diff --git a/src/openflexure_microscope_server/things/camera/simulation.py b/src/openflexure_microscope_server/things/camera/simulation.py
index 2882a216..80dadb55 100644
--- a/src/openflexure_microscope_server/things/camera/simulation.py
+++ b/src/openflexure_microscope_server/things/camera/simulation.py
@@ -54,7 +54,7 @@ class SimulatedCamera(BaseCamera):
         glyph_shape: tuple[int, int, int] = (91, 91, 3),
         canvas_shape: tuple[int, int, int] = (3000, 4000, 3),
         frame_interval: float = 0.1,
-    ):
+    ) -> None:
         """Initialise the simulated with settings for how images are generated.
 
         :param shape: The shape (size) of the generated image.
@@ -208,7 +208,7 @@ class SimulatedCamera(BaseCamera):
             pos = {"x": 0, "y": 0, "z": 0}
         return self.generate_image((pos["y"], pos["x"], pos["z"]))
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         """Start the capture thread when the Thing context manager is opened."""
         self.start_streaming()
         return self
@@ -218,7 +218,7 @@ class SimulatedCamera(BaseCamera):
         _exc_type: type[BaseException],
         _exc_value: Optional[BaseException],
         _traceback: Optional[TracebackType],
-    ):
+    ) -> None:
         """Close the capture thread when the Thing context manager is closed."""
         if self.stream_active:
             self._capture_enabled = False
diff --git a/src/openflexure_microscope_server/things/camera_stage_mapping.py b/src/openflexure_microscope_server/things/camera_stage_mapping.py
index d9281e22..a05a3385 100644
--- a/src/openflexure_microscope_server/things/camera_stage_mapping.py
+++ b/src/openflexure_microscope_server/things/camera_stage_mapping.py
@@ -62,7 +62,7 @@ class RecordedMove:
     for calibrating the stage as it allows measuring how long moves take.
     """
 
-    def __init__(self, stage: Stage):
+    def __init__(self, stage: Stage) -> None:
         """Set the stage client used for for movement.
 
         :param stage: the stage client to be used. ``stage.move_to_xyz_position`` will
@@ -72,7 +72,7 @@ class RecordedMove:
         self._current_position: Optional[CoordinateType] = None
         self._history: List[Tuple[float, Optional[CoordinateType]]] = []
 
-    def __call__(self, new_position: CoordinateType):
+    def __call__(self, new_position: CoordinateType) -> None:
         """Move to a new position, and record it."""
         self._history.append((time.time(), self._current_position))
         self._stage.move_to_xyz_position(xyz_pos=new_position)
@@ -99,7 +99,7 @@ class CSMUncalibratedError(HTTPException):
     live preview to move, or when performing a scan.
     """
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Customise the default error code and message of HTTPException."""
         HTTPException.__init__(
             self,
diff --git a/src/openflexure_microscope_server/things/smart_scan.py b/src/openflexure_microscope_server/things/smart_scan.py
index 3e0badba..ae723880 100644
--- a/src/openflexure_microscope_server/things/smart_scan.py
+++ b/src/openflexure_microscope_server/things/smart_scan.py
@@ -85,7 +85,7 @@ class SmartScanThing(lt.Thing):
     past scans.
     """
 
-    def __init__(self, scans_folder: str):
+    def __init__(self, scans_folder: str) -> None:
         """Initialise a SmartScanThing saving to and loading from the input directory.
 
         :param scans_folder: This is the path to the directory where all scans will be
diff --git a/src/openflexure_microscope_server/things/stage/__init__.py b/src/openflexure_microscope_server/things/stage/__init__.py
index f6a49590..4bbcacaf 100644
--- a/src/openflexure_microscope_server/things/stage/__init__.py
+++ b/src/openflexure_microscope_server/things/stage/__init__.py
@@ -45,7 +45,7 @@ class BaseStage(lt.Thing):
 
     _axis_names = ("x", "y", "z")
 
-    def __init__(self):
+    def __init__(self) -> None:
         """Initialise the stage.
 
         :raises RedefinedBaseMovementError: if ``move_relative`` and/or
diff --git a/src/openflexure_microscope_server/things/stage/dummy.py b/src/openflexure_microscope_server/things/stage/dummy.py
index b238c1c2..6758b37a 100644
--- a/src/openflexure_microscope_server/things/stage/dummy.py
+++ b/src/openflexure_microscope_server/things/stage/dummy.py
@@ -19,7 +19,7 @@ class DummyStage(BaseStage):
     hardware attached.
     """
 
-    def __init__(self, step_time: float = 0.001, **kwargs: Any):
+    def __init__(self, step_time: float = 0.001, **kwargs: Any) -> None:
         """Initialise the Dummy stage, setting the step_time to adjust the speed.
 
         :param step_time: The time in seconds per "motor" step. The default of 0.001
@@ -31,7 +31,7 @@ class DummyStage(BaseStage):
         self.step_time = step_time
         self.instantaneous_position = self._hardware_position
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         """Register the stage position when the Thing context manager is opened."""
         self.instantaneous_position = self._hardware_position
 
@@ -40,7 +40,7 @@ class DummyStage(BaseStage):
         _exc_type: type[BaseException],
         _exc_value: Optional[BaseException],
         _traceback: Optional[TracebackType],
-    ):
+    ) -> None:
         """Nothing to do when the Thing context manager is closed."""
 
     axis_inverted = lt.ThingSetting(
diff --git a/src/openflexure_microscope_server/things/stage/sangaboard.py b/src/openflexure_microscope_server/things/stage/sangaboard.py
index 05fb55a9..932fa373 100644
--- a/src/openflexure_microscope_server/things/stage/sangaboard.py
+++ b/src/openflexure_microscope_server/things/stage/sangaboard.py
@@ -25,7 +25,7 @@ class SangaboardThing(BaseStage):
     functionality is accessed by directly querying the serial interface.
     """
 
-    def __init__(self, port: str = None, **kwargs: Any):
+    def __init__(self, port: str = None, **kwargs: Any) -> None:
         """Initialise SangaboardThing.
 
         Initialise the "Thing", but do not initialise an underlying
@@ -42,7 +42,7 @@ class SangaboardThing(BaseStage):
         self.sangaboard_kwargs["port"] = port
         super().__init__(**kwargs)
 
-    def __enter__(self):
+    def __enter__(self) -> None:
         """Connect to the sangaboard when the Thing context manager is opened."""
         self._sangaboard = sangaboard.Sangaboard(**self.sangaboard_kwargs)
         self._sangaboard_lock = threading.RLock()
@@ -59,7 +59,7 @@ class SangaboardThing(BaseStage):
         _exc_type: type[BaseException],
         _exc_value: Optional[BaseException],
         _traceback: Optional[TracebackType],
-    ):
+    ) -> None:
         """Close the sangaboard connection when the Thing context manager is closed."""
         with self.sangaboard() as sb:
             sb.close()
diff --git a/src/openflexure_microscope_server/utilities.py b/src/openflexure_microscope_server/utilities.py
index 87503aaa..d9debd1e 100644
--- a/src/openflexure_microscope_server/utilities.py
+++ b/src/openflexure_microscope_server/utilities.py
@@ -78,7 +78,7 @@ class ErrorCapturingThread(Thread):
         kwargs: Optional[dict[str, Any]] = None,
         *,
         daemon: Optional[bool] = None,
-    ):
+    ) -> None:
         """Initialise with the same arguments as Thread."""
         # As all inputs are keywords we need to set the default values for args and kwargs:
         if args is None: