Well sorry robbie. I would beg to differ. PVA or stalizing solution WILL cover and WILLl stop nicotine from bleeding through. Have used it very successfully. Also it is OK on woodwork.Would suggest you change trades.
If you are a perfectly honest law abiding citizen and treat all coppers POLITELY, then you should not have any problems. If however you are not and treat them impolitely then you deserve whatever you get.
It might be the multi-function/program switch. The newer ones are computer controlled, but older machines use multi contacts with a timer mechanism. Over time the contacts arc out.New switch probably in excess of £70.
Get a broom handle. Push it through the top handle of a large watering can (garden type). Fasten assembly above bath or shower cubicle. Screw a hook/eye in the ceiling. Attach string to side handle and pass over hook/eye down to a weight. To operate pull string. No electrical problems, or cost...