diff --git a/scripts/zenodo/upload_to_zenodo.py b/scripts/zenodo/upload_to_zenodo.py
index aa30ce18..64eefdeb 100644
--- a/scripts/zenodo/upload_to_zenodo.py
+++ b/scripts/zenodo/upload_to_zenodo.py
@@ -1,5 +1,4 @@
 import os
-import requests
 from argparse import ArgumentParser, Namespace
 from zenodo import Zenodo
 import yaml
diff --git a/src/openflexure_microscope_server/server.py b/src/openflexure_microscope_server/server.py
index b1800181..027fcf22 100644
--- a/src/openflexure_microscope_server/server.py
+++ b/src/openflexure_microscope_server/server.py
@@ -1,10 +1,6 @@
 from __future__ import annotations
 import logging
-import importlib.resources
-import os.path
 from fastapi import Response
-from fastapi.staticfiles import StaticFiles
-from fastapi.responses import FileResponse, RedirectResponse
 from labthings_fastapi.thing_server import ThingServer
 from labthings_sangaboard import SangaboardThing
 from labthings_picamera2.thing import StreamingPiCamera2
@@ -42,6 +38,7 @@ app = thing_server.app
 # This is necessary until Connect is rebuilt.
 @app.get("/routes")
 def routes_stub() -> dict[str, dict]:
+    """A stub list of routes, used by OF Connect to identify the microscope"""
     fake_routes = [
         "/api/v2/",
         "/api/v2/streams/snapshot",
@@ -54,5 +51,6 @@ class JPEGResponse(Response):
 @app.get("/api/v2/streams/snapshot")
 @app.head("/api/v2/streams/snapshot")
 async def thumbnail() -> JPEGResponse:
+    """A low-resolution snapshot, for compatibility with OF connect"""
     blob = await thing_server.things["/camera/"].lores_mjpeg_stream.grab_frame()
-    return JPEGResponse(blob)
\ No newline at end of file
+    return JPEGResponse(blob)
diff --git a/src/openflexure_microscope_server/things/camera_stage_mapping.py b/src/openflexure_microscope_server/things/camera_stage_mapping.py
index a29454b2..6a649e9f 100644
--- a/src/openflexure_microscope_server/things/camera_stage_mapping.py
+++ b/src/openflexure_microscope_server/things/camera_stage_mapping.py
@@ -10,24 +10,18 @@ and return the calibration data.
 This module is only intended to be called from the OpenFlexure Microscope
 server, and depends on that server and its underlying LabThings library.
 """
-import io
-import json
 import logging
-import os
 import time
-from typing import Annotated, Any, Callable, Dict, List, NamedTuple, Optional, Tuple
+from typing import Annotated, Any, Callable, Dict, List, Mapping, NamedTuple, Optional, Sequence, Tuple
 from fastapi import Depends, HTTPException
 
 import numpy as np
 from pydantic import BaseModel
-import PIL
 from camera_stage_mapping.camera_stage_calibration_1d import (
     calibrate_backlash_1d,
     image_to_stage_displacement_from_1d,
 )
 from camera_stage_mapping.camera_stage_tracker import Tracker
-from camera_stage_mapping.closed_loop_move import closed_loop_move, closed_loop_scan
-from camera_stage_mapping.scan_coords_times import ordered_spiral
 
 from labthings_picamera2.thing import StreamingPiCamera2
 from labthings_sangaboard import SangaboardThing
@@ -53,8 +47,10 @@ class HardwareInterfaceModel(BaseModel):
 def make_hardware_interface(stage: Stage, camera: Camera) -> HardwareInterfaceModel:
     """Construct the functions we need to interface with the hardware"""
     axes = stage.axis_names
-    pos2dict = lambda pos: {k: p for k, p in zip(axes, pos)}
-    dict2pos = lambda posd: tuple(posd[k] for k in axes if k in posd)
+    def pos2dict(pos: Sequence[float]) -> Mapping[str, float]:
+        return {k: p for k, p in zip(axes, pos)}
+    def dict2pos(posd: Mapping[str, float]) -> Sequence[float]:
+        return tuple(posd[k] for k in axes if k in posd)
     def move(pos: CoordinateType) -> None:
         current_pos = stage.position
         new_pos = pos2dict(pos)
diff --git a/src/openflexure_microscope_server/things/settings_manager.py b/src/openflexure_microscope_server/things/settings_manager.py
index ecaf4c9c..1769b3e4 100644
--- a/src/openflexure_microscope_server/things/settings_manager.py
+++ b/src/openflexure_microscope_server/things/settings_manager.py
@@ -6,12 +6,11 @@ for code that currently lives in clients but needs to persist settings on
 the server.
 """
 from collections.abc import Mapping
-from typing import Any, Mapping, MutableMapping, Optional, Sequence
+from typing import Any, MutableMapping, Optional, Sequence
 from fastapi import HTTPException
 from labthings_fastapi.dependencies.metadata import GetThingStates
 from labthings_fastapi.thing import Thing
 from labthings_fastapi.decorators import thing_action, thing_property
-from pydantic import BaseModel
 
 
 def recursive_update(old_dict: MutableMapping, update: Mapping):
diff --git a/tests/test_capture_manager.py b/tests/test_capture_manager.py
index 8a1260d3..16fb768b 100644
--- a/tests/test_capture_manager.py
+++ b/tests/test_capture_manager.py
@@ -1,5 +1,4 @@
 import os
-from typing import Type
 
 import pytest
 from freezegun import freeze_time
diff --git a/tests/test_json.py b/tests/test_json.py
index 0e365e6a..0bd53f9f 100644
--- a/tests/test_json.py
+++ b/tests/test_json.py
@@ -1,8 +1,6 @@
 import json
-import re
 import uuid
 from fractions import Fraction
-from uuid import uuid3
 
 import numpy as np
 import pytest