Addison Lee
Moves people and parcels around London on scooters.
http://www.addisonlee.com/

HGB Motorcycles
You can hire a motorbike from these guys for as little as one day.
http://www.hgbmotorcycles.co.uk/splash.htm

Metal Horse
Hires out Harley Davidsons.
http://www.metalhorse.com/

Raceways
Raceways has two branches offering bikes for hire from a range of different manufacturers.
http://www.raceways.net/

Rent a Moped.com
Mopeds available for both short and long-term rental.
http://www.rentamoped.com/

Virgin Limobike
A chauffeur driven motorbike service.
http://www.virgin.com/subsites/virginlimobike/

Warr's
All the latest Harleys available to rent for long or short periods.
http://www.harley-davidson-london.co.uk/