DerbyBorn wrote in
2.236:

....but aren't they intended for occassional use to isolate the shower
and not for routine switching? I would think you could pull them off
the ceiling if used frequently.

Rightly or wrongly, in my previous house, I used to use the isolation
switch to switch the shower on and off every time! My rationale was that
it's cheaper to wear out an £8 isolation switch than the rotary switch on
the shower unit, which, if broken, would probably require the replacement
of the entire shower unit. I also liked doing it that way because by the
time I got into the shower cubicle the water was already running at the
desired temperature.

Apart from shortening the life of the isolation switch, is there any known
reason why one should not do this?

Anyway, I took the duff Wickes' switch back and got one from B&Q instead.
The B&Q one cost £1 more, but it works perfectly. The B&Q switch looks
identical to the Wickes one (apart from the packaging), so it may even have
come from the same factory.

Jim