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Hi guys... well, I managed to fit the new isolator switch with absolutely no trouble - there was plenty of slack in the cables all ok there... Trouble is, the pesky thing still doesn't work !
I asked a mate of mine who has electrickery testing gear to check on these bits of the circuit:-
New Isolator Switch - all ok, it is fine
Existing Fuse (32A) on its own circuit - all ok
Supply cabling - all ok
Load cabling - dead as a dodo.... oh dear
I am now thinking that maybe the electric shower itself is at fault as the cabling to the shower looks in really good nick.... Do electric showers have internal fuses ? I will not proceed with this obviously - it's beyond my ken of electrickery and will employ the services of a fine electrickery expert but is it likely that the shower itself could be the wee culprit ?