Ordered this on pre-order the other day, it has now dropped to £21.49 and under amazon.co.uk's policy if the price goes up you don't pay more than at the time you order. If the price drops again you will pay the lowest price.
Next cheapest is £25 from Play.com
Also makes a change that we are cheaper than the US Amazon.com ($60)
Can't wait for it to come out...