Don't always go for the obvious!
Four years ago we had a central ceiling light fitted in the lounge of our bungalow. At the same time I put in replacement wall lights and the single wall light switch was replaced by a 2-gang Quinetic switch. Two Quinetic receivers were installed in the loft - one for the new ceiling light and one for the wall lights. There had been a ceiling light at one time, as the cabling and junction box were there.
All worked fine until this morning. The ceiling light didn't come on, but the wall lights were ok. I tried several times but the ceiling light just didn't respond to the Quinetic switch. Thankfully, when I tried an hour later all was well with both lights. That makes no sense, but I was pleased it was working again (they are on the same supply from the CU).
In the meantime, I was thinking about the problem of testing and replacing either the ceiling light transmitter or receiver (or both). If either needed replacing, access would be required to get to the receiver to pair it with the transmitter. The ceiling light receiver had been placed by the original junction box, and that was in a area of the loft only accessible by crawling behind the hot and cold water tanks, and the expansion tank, and wriggling through the A frame, all with barely a metre of height available. It struck me that I should have put the receiver in a much more accessible position by running 3 metre cables from the junction box to it. I could then easily see if it was working and/or required replacing.
As I said, a bit of forward thinking!