My old horse was freezemarked with his name on his bum - only an extra £5 for a private plate, bargain! Put me off straying from the official rights of way though...
I've just had her ladyship microchipped but to be honest I would have preferred a freezemark. Trouble is she is blue & white, she will bleach out so I would have had to get her mega-freezemarked so the hair fell out. She has sensitive skin that burns easily so I didn't think it would be a good idea, all things considered.