Hello,
I got the keypad here http://uk.farnell.com/jsp/search/productdetail.jsp?SKU=1774829.
Will you upload a video
A video would be short and not very interesting. ;D
Hyacinth insists on living on her own, and is delighted with the remote as she finds it much easier to use than the manufacturers remote, which was the whole idea.
Seems to be something I could do as well.
Of course you could. I built the (few) components on stripboard, and stuck the pcb and battery holder in the box with double-sided pads. The keypad connects with a standard header strip. I salvaged the IR diode from a defunct remote.