Many thanks. As well as waiting for someone to take a look at it, I managed to get it to a local car mechanic this morning and he said he could fix it for £30 all in. He said that he'd need to move the control box though, so before I let him 'at it', is anyone able to assure me that if I follow C5 Martin's wiring instructions, the control box will be simple enough to remove then put back?
The mechanic said he could fix the chassis without a total strip down, but then he doesn't deal with C5's, so we'll see I guess.