Asda, in Cambridge at least, have 8 of these in stock. They first put boxes out on display Monday and I went back twice before I had luck. They have blue and black ones.
What's special about them is they have 11" 1366x768 hires screens, when most netbooks have only 1024x600 or worse.
Other specs are typical: 1GB ram, 160GB drive, SD/SDHC card reader, 802.11b/g wifi (not N), three USB, VGA socket, 10/100 ethernet (not gigE) and headphone + microphone audio sockets.
They're not the highest performers with an Atom Z520, but good enough to do web browsing*, email etc.
Thanks to the person who posted a link to the online offers:
(for some reason I can't add the link to this offer - the "direct link" boxes are disabled. also can't do the [url] bit either, sorry)
* please do yourself a favour and install firefox and get the "flashblock" add-on to prevent drive-by virus attacks!