Yep - that is the most obvious solution, but could do without spending a London based elcticians call-out charge if it is a comon or simple resolution . . .
I have recently moved into a house and replaced all the light switches with brushed steel face plates. When touching the face plate, you get a small constant electric shock that is definitely not caused by static. It is not painful, but is annoying!
Funnily enough it also happens when you...