Shout out to Malc Crook (https://hackaday.io/mal8837) and Adam (https://hackaday.io/Bobbsta10) who both contacted me to say that the PIR linked to in the original post is no longer the one you get when you order the same item from the same seller.
Fear not, for I have hacked the new one this evening and it’s pretty straight forward.
Okay, I'm editing this as my first attempt has been badly mangled somehow. Starting to regret using hackaday.io for this, seriously guys is there no markdown or something I can use with copy and paste from somewhere else or a preview option?!
Switches are simple right? You'd think so but when talking about home automation, not so much. Trying to find a UK back box switch of the right kind turned out to be harder than I thought...
When I decided to embark on a home automation project, I spoke to a few people, read some websites and did some thinking. You might well expect that for a project that is a substantial financial outlay and a commitment to an eco system that will be with you for a long time.
Thanks for sharing it. I will definitely use these products in my custom smart home by https://www.newdayconstruction.co/custom-homes