Delivery is £3.95 per order, making this still cheaper than Play, Amazon, etc.
You can get 2 x 2GB RAM (4GB) for £51.93 delivered.
This is 200-pin, Non EEC, good for most Dells + Apples + many others. You'll pay £32.99 for 2GB RAM with play.com at the moment - and that's for the slower DDR2-5300 RAM
If you need to check compatibility for your system, go here and check the memory advisor tool: http://www.crucial.com/uk/
Don't forget Quidco for 2% - tracks fast.