Hi John.
Sorry about the referencing & threading, I'm subscribing to this thread via my iPhone which doesn't integrate very well with groups.

I have taken the top off the cabinet whilst in situ, there are no labels on the outside of it pertaining to electrical specs, only one about halogen lamps being very hot. Inside the top, the electrical gear consists if a standard low voltage lamp transformer/konvertor ( it's German). There is an earth wire from the mains connected directly to the metal casing, via an enclosed choc block and a crimped earth terminal (hoop). The 'konvertor' is marked with the double insulated box icon! So, from what's been posted, does this mean the tingling is not caused by poor component leakage? Should I be checking the continuity of the earthing on the main line in?

Many thanks for the assistance,
Deano