You probably mean Mark Holden - highly regarded and I have used him many a time, as have many colleagues and friends. He used to be right in the centre of Bromley but has recently moved out further along the A21, near to the Vauxhall dealers before the college. He has his own solo unit there. I can't recall the address off hand.
Try 0208 464 4400 - this might be the old workshop number where he shared with the car guys (I am going from memory at this time). If it is then Roy will supply his new number.