Might not be the most popular post and don't know if HMV really have them in stock... but according to their website they have some models of iPad 2 in stock ready for dispatch in 24 hours. They also have £5 off via the code 5HMVOFF50 *thanks to original poster of this) and quidco. If you have an HMV pure card you can also get quite a lot extra points for the purchase.
Not an earth shattering price, but if they have them in stock then less than RRP must be pretty decent. Delivery is free within the UK.