Seems to be the cheapest price for a pre-order atm and might even be the cheapest price when it finally get released. Amazon is selling it for 102.99 which could be the retail price?! Comes out on May 6th 2011.
£87.99 delivered doesn't seem to be a bad price for this awesome piece and 1% quidco. However, it does state in the website that Base may not get their stock until 20/06/11