Andy,
I use Cliff Lowe at Project Nine, he's near Maidstone
http://www.projectnineengineering.co.uk/
Its not exactly round the corner but he's a really good bloke and wont stiff you. His service pricing for 964's is way below just about anyone else as well
I would thoroughly recommend him
He does have a small courtesy car now I think though I just got the train in and out when mine was there
Alternatively you could use Bill Insley, who's based in Orpington and does mobile or works from his house. Again very experienced and a nice guy 07850 834851 was his number last time I heard
Hope that helps
Hve you had your celebration long, and what colour? Ive only seen a few and they are lovely looking cars
Regards
Gary