Well I think I have found the problem; the tank is holed. It has not been apparent over the past week because of the wet weather making the area generally damp, but the rest of the area has dried out today and left obvious dampness around the HWS. I isolated it and took the cover off the element to check resistance; water ran out from behind the cover and it is very obvious that there is water between the tank and the outer cladding. For what it's worth, the wiring is intact and there is continuity across the element but I guess that's not going to save it!
Thanks for all the helpful advice.


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