Spotted these on sale in my local ASDA. Not sure if it's only store specific but the price label suggested it is potentially a nationwide deal. Not available from ASDA Online as far as I know - I've checked.
The batteries are nothing special but pretty good for the price, plus the charger should be suitable for some of the long life rechargeables that need a slower charge time.
Cheapest I can find this on Amazon is £9.99 (£14.34 from Amazon direct) so I reckon this is a very good price if you can find one.
It's the same as this one:http://www.amazon.co.uk/Energizer-Value-Charger-1300mah-Batteries/dp/B002FKRHUO/ref=sr_1_3?ie=UTF8&qid=1302547025&sr=8-3
Also noticed they were selling packs of 4 Energizer AA 2000mah rechargeable batteries for £2.50 as well.