Hi all, just thought I'd let you guys in the UK, know about some decent little supplies in case you need them, cheap as well!
http://www.maplin.co.uk/6000mah-portable-power-bank-for-mobile-devices-625614
^^^Looks more or less identical to the one for sale in the Hak5 shop, and comes with a few fittings of various sizes, only downside is, there is only one usb output, I am thinking about getting this one as well.
http://www.maplin.co.uk/5000mah-portable-power-bank-for-mobile-devices-612208
This one has 2 usb ports, one of which supplies double the power of the other port, handy if you need a bit of a extra boost for a usb hub:)