Uniross Sprint 15 min Battery Charger + 4 x 2100mAh AA batteries - £17.94 or less delivered from Mymemory.co.uk
Go through Quidco for 4% cashback. Good price for Uniross 15 min charger.
Edit: You can get this for £12.50 + p&p from Amazon. Thanks to centurion^ for this pointer.
Description: The Uniross SPRINT 15 minute battery charger is one of the fastest and most efficient battery chargers available. It will fully charge the supplied 4 x 2100mAh AA batteries in just 15 minutes! Intelligent Delta V detection system which ends charging the moment a battery reaches full charge. You can "top up" your batteries at any time and over-charging is impossible.
Specification: Full charge in 15 minutes | Supplied with 4 x 2100 Ni-MH AA's (Uniross 15 Minute Batteries) | Independent cell charging | Weight : 207g