You need to claim your £40 cashback from Nikon UK by 04/05/11.
I've recently ordered this camera from Currys for the same price so Amazon has price matched it without needing any voucher and despatched from Amazon itself plus free delivery as usual.
PS: After quidco or tcb the Currys offer is better though. Thanks "the poster" for the info.
Manufacturer's description. Copied and pasted.
The D3100 is designed for newcomers to D-SLR photography, especially young families who want to take beautiful pictures without worrying about complicated functionality. A range of automatic settings means the camera will do all the hard work much like on a compact camera: Live View with Scene Auto Selector selects the mode that best matches your shooting situation; Scene Recognition delivers sharply defined images by analysing the scene and optimising the camera settings immediately before the shutter is released; and Guide Mode will take you step-by-step through the process of how to get the picture you want.