I'm an Army qualified sparky from the 1970's, but moved out of the industry after leaving, so do not have a high amount of practical experience, apart from work in my own home.
The low voltage halogen light in my WC has failed, however, the mains cable to the transformer is snagged, probably when a plasterboard ceiling was fitted below the original artexed one so by dropping the existing fitting I cannot access the transformer or its feed cable.
I would like to isolate the existing...