Hmm, I have opened up the remote looking for gunk, and I found biscuit crumbs, scraps of hair, and...
GUNK!!!!!!!!!!!!
The normal switches were bad enough but for some reason they had decided to make the power switch with a dome-shaped piece of metal held in place by a sticky pad... Gunk everywhere, including above, round, and under the piece of metal. I'm not convinced that it is all going to stay in place now I have degunked it and stuck it back down. I'm leaving it for a while for any residual drops of degunking water to evaporate. Meanwhile - enjoy some gunky pics...!
Gunk (and detritus) on rubbery switch pad:
View attachment 610189
Gunk (and detritus) from rubbery switch pad on otherwise pristine white paper:
View attachment 610187
Gunk on the circuit board:
View attachment 610188
I'm just having a mug of tea and will then see if I have successfully...
... killed the remote control altogether!