It's not a PC, but then there's no section for this sort of thing. The Advent Vega (a re-badged Shuttle P10AN01) has dropped £50 to £199.99 at Dixons: http://www.dixons.co.uk/gbuk/advent-vega-tablet-pc-512mb-09149756-pdt.html

They're great little machines. The viewing angels aren't great, but everything else is fantastic value for money; 10.1" screen, Android 2.2, Tegra 2 processor, 512MB ROM & RAM, 4GB SD Card, HDMI out, webcam (we picked up 2 in December at £250 each). You need to do some fiddling to get the market on it, but it's easy enough.