Saw this today and nabbed it as a spare phone for work. Alcatel VM621i - £9.99 + £10.00 top up,on the Virgin network. Available in steel grey and pink.
Decent liitle phone; has an mp3 player [although you will need a micro SD card], 1.3 megapixel camera, WAP, basic organiser and Bluetooth.
Good build quality and as easy to use as some entry level Nokias.
Full specifications here:http://www.virginmobile.com/vm/viewProduct.do?productId=E4C1D815-B5D6-4B90-B148-070AEA725F50
Also worth noting Virgin media outlets have a similar deal: phone £14.99 + £5.00 top up.