Metropolis in Vauxhall charge £90 per hour, West London Motorcycles £55+VAT and Snells at Alton, who only sell and service Ducatis, less again, I believe, but I'm not sure of the exact figure.
Rang around last week. Snells - £55 + vat Pro Twins - £45 + vat In Moto - £66 + vat P & H - £49.50 + vat