Mate really feel for your friend, that is a nice rado, agree with blue on this one, the car is most like to have been targeted. The thing is if it had been taken for joy riding them it mostly would have been found by now Ruth dumped or burnt out. Like boy said possible strip down for parts, any distinctive parts on it, keep an eye out around local papers, scrap yards and internet to see if anyone is advertising rado parts?
Good luck mate and keeps us informed on how the hunt goes.