After having RS components move the back order ship date on my order from 8 December, to 18 to 27 to 31, then to 18 January and finally 31 January, I decided to source another supplier.
Mouser have kits in stock. I ordered Wednesday morning and it was shipped from the States and I received it in the UK Friday morning. P&P included for orders over £50, the price from mouser: £76.10 inc VAT - cheaper than on the Arduino store.
I hope that helps!
http://uk.mouser.com/Search/ProductDetail.aspx?R=K000007virtualkey99990000virtualkey782-K000007