UPDATE: Deal is still valid from Dixons (LOGIT10 code still works!)
Click on Amazon on the right under More Buying Choices - 1-3 week dispatch. Reviews look great - it's been posted a few times, but cheapest I can currently find.
Product Description: Logitech Wireless Desktop MK250 - keyboard , mouse
Device Type: Keyboard
Localisation: English - United Kingdom
Connectivity Technology: Wireless - 2.4 GHz
Wireless Receiver: USB wireless receiver
Pointing Device / Manipulator: Mouse
Battery: 3 x AA / AAA
OS Required: Microsoft Windows Vista / XP / 7
Microsoft Certification: Compatible with Windows 7
Edit: This is also available from Dixons for £14.99 (but works out cheaper with 3% QUIDCO and 10% LOGIT10 Code - many thanks to blammo for pointing this out):http://www.dixons.co.uk/gbuk/logitech-mk250-wireless-mouse-and-keyboard-set-black-for-pc-06282245-pdt.html?