It looks like the Prestige Edition of Modern Warfare 2 has sold out in the UK.
The limited edition SKU, which was made available to pre-order yesterday exclusively at HMV.com, is now unavailable to order, with a notice stating that the title has since been "deleted".
Both the Standard and Hardened Editions of the game are still available to pre-order.
UPDATE: It's available to pre-order again now. Glitch? Increased allocation? Who knows - just get your order in quick if you want one.