I would endorse Leila's approach.
If this is not successful, I'd get a bloody big A-frame sign and stick it on the roof of a car or van, and park it in front of his surgery.
Write some suitably heart wrenching plea on the sign that will embarass him.
Just leave it there for the day. I'm sure he'll call
(I haven't actually done this, but have heard that this tactic worked wonders when used against dodgy car dealers, etc. )
If you're legally parked, I don't think that the police could give you any grief either.
Cheers, Eric G.