Thanks Nigel. After a long lunchtime phoning around and visiting some of the above (and a few more besides!) I've decided to order from AP MotorStore - should be with me tomorrow.
It's for the Cerb, which is being collected on Saturday - hence the urgency...
I believe the standard response is along the lines of "Holy thread resurrection, Batman". Thanks PipemanPete - but I sold the Cerb 6 years ago, and haven't lived in Northants for the last 4 years. But I appreciate you taking to time to reply.