Just refreshing this topic in view of the likely requirement regarding UK registration becoming compulsory in November 2018.
A few years back I produced some polyester labels on a Brady thermal printer. The one on the Phantom camera has been attached for a few years now and shows no sign of wear.
Size is 13 x 25mm (.5" x 1").
I have the P-Touch Home & Hobby labelmaker. Black lettering on a while label looks real good. I put my name and phone number on the AC and all batteries, as well as on many items in my vast camera arsenal.