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It was more like tingles than shocks to begin with. Plus the sporadic nature of it, and the fact that it would never show itself unless you were actually stood in the shower and the wall happened to be soaking (info we didn't realise at the time) - meaning that whenever an electrician tested the shower it showed up as fine. So that it was difficult to see anything was wrong. If you're not expecting mains current in your shower then it's surprising how you excuse it!
The most surprising part of that story is that you all kept using the shower having had 1 electric shock.