Just looked at Tesco's site about it, and it deffo says 512, uncapped for £19.97 per month.....

wonder who the ISP is then? Cos I'm paying £27 a month for 512 uncapped from the (old) Freeserve ISP (reluctant to change to 1meg cos it's now Wanadoo and all theirs are capped now

If I can get more info on who the ISP is for Tesco and how reliable and quick it is, I might make the swap too....