Did another couple of hours on my electrics this evening. My new radio/CD came late this afternoon, so having read the instructions I ventured out to see if it would work in the car. Nothing's ever simple of course, and it remained stubbornly dead as the previous owners have done quite a lot of unorthodox rewiring. With circuit tester and multimeter I managed at last to get it working by pulling the pins out of a multiplug and putting them back in different holes. Only blew one fuse. Now I've discovered that whilst the passenger side speaker is nice and clear (after I located its wires and reconnected it) the speaker in the driver's footwell gives a lot of distortion. So I've ordered another.