I've seen these knocking around at maplin too, I'd be interested to know if they're any good
I have one of those. The keyring attachment is really flimsy (looks like you swapped yours paul) and the tint is real yucky. But for the price they do the job.
I have a rebranded (GP) version that so far my children haven't swiped. Not often anyway Nice little backup, normally hangs on a hook near the fuse box.
I nearly picked one up too at that price but I have the True Utility 3 led one which is brighter and about the same size. As for the batteries, I bought 100 very cheap at DX and put them in the freezer http://www.dealextreme.com/details.dx/sku.61