No-more Nails. It's great for electrics and when you peel it off (and it comes off in one!), there is no residue. I think Lee Martin flogs very similar (if not the same) under his own label. The above looks the identical.
http://www.unibond.co.uk/en/diy-adhe...on-a-roll.html
http://l-m-racing.co.uk/products/ind...&product_id=52