It’s possible they fired up the transmitter one last time to tell the rts devices to use the internal program as mentioned.
Maybe too many complaints of ppl with cold water ?
I think this is what you requested.
2 pin top and bottom.
Looks like it will do shaver and euro.
https://www.ebay.co.uk/itm/197974128844?var=497206186050
If you buy one, let me know(what you think). I was tempted to get one for the Xmas decorations.
The main one is for heating control. 5 core.
or look at the voltage spec of towbar / traffic light cables. 7 Core These should be available in short lengths