The title says it all really. Potentially 20 long life AA or AAA batteries for a fiver (and not generic branded ones either)
Instore at Currys in Trowbridge, Wiltshire, they are offering ANY 5 packs of Philips Extremelife batteries for £5 (normally £3.49 each). This can be mixed and matched, so you can get AA, AAA, C or D batteries in your '5'.
This maybe a local only offer, but when the batteries are scanned, if the assistant looks under customer offers, the price will drop to £1 per pack, so it should mean that any Currys store can do the offer.
The offer is only available this weekend.