If you paid �60 and the fault was not rectified, then you have indeed been ripped off. In any case, if you are getting shocks from the shower head, you should turn the shower off and stop using it. I would suggest getting someone else to repair/replace the shower and get three different quotes from 3 different Plumbers. You could get the shower tested by an electrician, but this would of course cost money, and if the problem is not a wiring fault, you will probably still need to replace the shower. I would guess that the shower has developed a fault, as it seems to have only started to occur recently, but that is only a guess.. One thing to note, there has been a change of regulations and showers now need to be wired with heavier duty cable than before. This may mean it will need to be re wired.