I brought a reflective collar with a space to write on from this website.
Buy Reflective Cat Collars Online - The Pet Extraordinarium
Only thing is it has a buckle collar rather than the quick release clip but does have some give in it due to a piece of elastic. I ws a little worried my cat may get caught on something with it on.
Or this one does personalised collars so you can have your name/number on the collar itself. Kitty Collars: Safe Cat Collars UK - Cat Safety Collars UK

KK