So far the cheapest PAYG Nokia 5530 I have seen.... The phone itself is brilliant, its got kinetic scrolling (iPhone like), 434mhz CPU (same as N97), and also runs the same Symbian Operating System as N97. comes with 4GB microSD card, can get up to 16GB.
Its quite snappy, unlike the Nokia 5800 and a tad bit thinner than it. It doesnt sport GPS or 3G, but has Wifi, EDGE, which in my opinion is okay, because 3G is gonna set you back atleast 7.5gbp/ month and most of them cap you at 1gb/month which is ridiculous.
For more specs. visit http://www.gsmarena.com/nokia_5530_xpressmusic-2832.php
ALSO £10 via Quidco for a despatched PAYG handset