Apologies for bump, but missed this one first time round.
I saw this on National Pet Register and phoned the lady, because my BG has been missing since mid-September (anyone who abused me on CC back in September for not making any effort, please note).
As a result, Joyce caught him and took him to the vet for scanning for a chip - not my cat sadly. But the feller was chipped and is now back at his own home in Staines in Essex. A good outcome.