Not sure if this has been posted before, but Maplins are now selling Arduinos and a few shields. These are all Revision 3 boards.
However, only shields appear to be in stock. 
Interesting, Just looked at the maplin site.
They have books in stock and the android mega adk.
The main boards are on order.
But as usual with maplins the prices are a bit on the strong side.
But handy if you need something in a hurry, I have 2 stores with half an hour of home.
Gordon