Hi Simon,
Thanks for the heads-up.
For info, I purchased a Hue Motion Sensor, another Aqara Double Rocker Switch and some additional Aqara Temperature sensors.
I was having a lot of difficulty pairing them - like they wouldn't (despite having the config set to allowing join)! Anyway, applied the standard engineering solution, closed down zigbee2mqtt, unplugged the CC2531, waited 10 seconds (probably not necessary), plugged it back in again and restarted zigbee2mqqt.
Lo and behold pairing then worked again for all the new devices.
I am trying out using the Aqara Temperature Sensors to monitor the temperature of the incoming radiator hot water pipes on some of the radiators controlled by troublesome Spirits. It's early days but it does help to give some indication if the radiator isn't heating when it should be or vice-versa, heating when it shouldn't.
Thingiverse came up with the goods and I found a 3D model to attach the Aqara Temperature Sensor to a 15mm radiator pipe:
Xiaomi temperature humidity sensor mount 15mm pipeIt is not perfect for fitting to an already installed pipe but with a bit of judicious use of a saw on the 3D print, I persuaded it to fit. If I get the time and inclination, I might try to modify the model so I don't need to use a saw on it.