Originally went looking for http://www.hotukdeals.com/deals/energizer-energi-go-xp2000-power-pack-mispriced-2-instore-tesco/904935
but no stock. They had the XP1000 power pack in stock marked £20 on the shelf. It scanned through at £1.25 so I bought the two they had in Beckton. Not as powerful as the one posted yesterday but may be of some use to someone who can't find the XP2000. Can't really go wrong at this price!!!
The Energizer - XP1000 Mobile Charger is an ideal emergency charger for mobile phones, MP3 players and Bluetooth® headsets.
With a built-in battery, the XP1000 provides up to 6 hours extra talk time to a mobile phone, up to 30 hours extra Music time to an MP3 player and up to 34 hours extra talk time to a bluetooth headset. Pre-charged and ready to use right out of the box, the XP1000 is instant power.
Rechargeable up to 500 times the XP1000 includes a user manual, travel bag, 5 volt USB charging cable and 4 mobile phone tips covering Apple, Mini USB, Nokia and Micro USB.