Been watching this for years although I skipped most of Sylvester McCoy.
Watched the Christmas episode but seeing him in a skirt I thought nope no more.
I agree a box ticking exercise and shan't even have a gander.
Probably wasting your time. The chances of it being free from conductive parts of the electrical installation is probably zero especially if the steelwork is the main structure as opposed to a small "floating" part.
It is a functional switch therefore it should be capable of that function. Small gentle tap with a smallish hammer normally resolves it then remove the flaked paint.
5.18 of the Inspection Schedule, Condition of accessories............. is relevant.