How do I Unlock my Ford Radio?

Hi -I have just bought an ole banger ford - but the radio has locked ( I have the code) but more than 10 attempts were made. The radio will not even turn on and display 'Enter code'. Is this because a fuse has gone? Have tried disconnecting the battery overnight - no luck! Owners manual says contact your Ford Dealership - that means ££££££'s which I don't have! Is there a way out?? or am I radioless forever!!?

Alastair
October 2008