Thanks, managed to fix it. Took the radio, ashtray out and the cigarette lighter trim off. Found that the inner part of the lighter had unwound itself from the power supply. So screwed the inner piece back to the outer. Connecting the power lead was a bit fiddly as there's not much room but managed it OK. Probably would have been easier taking the bottom part of the dash off.

Why can't they make it easy so it pushes in from the front!!!