I hired a GSX R 1000 K4 as my bike would not have been ideal for a recent long-ish haul  trip.
 Excellent service. 
http://www.greenlightbikes.co.uk/ £399 inc vat for 7 days in fully comp.
 No problem arriving late / early collection as they're happy to offer an out of hours service as I arrived at 9pm to hand the bike back.
 Very "nice" bloke and a new business too.
 You can hire gear too. Trews were £15 for the week.
 Based in Burton upon Trent - ie the Nottingham / Derby area. 
 Tim