London - Canary Wharf side is our nearest and where i got mine done.
www.permagard.info - the contact number on there will put you in touch with Mike who's a very friendly guy.
Price starts at £130 for the exterior, i paid slightly more as my paint was very oxidised. They'll tell you once they've seen your car what they think to the quality of the paintwork.
I think Ollie also had the interior done - sure he'll be able to confirm that and what he paid!
I'm booking mine in for it's annual service at Canary Wharf. To keep the Warranty going indefinitely you have to have it serviced 11 months after first application +/- 1 month, so I'm booking mine in now and will keep the post updated (including pics) for anyone interested in this treatment.