First thing we found was shower head was (after 12 years NOT being used) cracked or fractured and seeping water,
Light switch had gone a bit sketchy too, making contact occasionally,
while I was away I ordered both (Ebay) and they were on mat this morning when we got back, all bolted on and only succeeded in blowing a couple of fuses while swapping this switch out
(remember to switch power main switch off next time)