If you need to return one or swap it out, don't call TheTechGuys for tech support, totally useless, barely heard of it. One of them actually suggested I try turning it off and back on again lol. Also don't bother with the sales people, they can't help either. To handle returns etc you must call the customer service team, only they can action swaps.
Rather than sit here like a lemon from 9am to 5pm for the courier to come to collect I've arranged to drop the device at a local store, and DHL are going there. I think you can only take them to the store if it has been prearranged with the CS team.
What an appalling waste of time and a bad experience, but I keep reminding myself it's a 10" tablet for £250, and the one I have that works is running like a dream. My slug of a Win7 netbook will be going straight on eBay, bye bye!