I think Bob works for a dealers of some kind. This website is called "Fixed4Free" not "Take It To A Dealers And Pay Them £10 For 5 Minutes Work" No thief would bother stealing a crappy radio cassette, it has no resale value. CD units are a different matter.
There are various radio decoding programs available on eBay for as little as 99p. You need to dismantle the dash extract the radio and note down the serial numbers. You then enter the numbers into the program and it gives you the code.
Jock, October 2007