As some of you know, we are having to move house to accommodate my eventual destination in a wheelchair so I've been looking around a bit and chatting on another forum I'm part of and I thought people here might be interested in the following - and also may think of some headings I've missed?

* Turning lights off and on

One suggestion has been to use TP-Link KL50B smart bulbs for that, Andy. Work with Alexa, Google Home,
TP-Link KASA, and even Samsung SmartThings on TV!

Note they can be dimmed too (no dimmer switch required), both by voice and on your phone.

* turning on power supplies

One suggestion is the HS100:

* operating TV and other linked infrared devices

* opening and closing doors
* opening and closing doors that have to be locked