You should be able to scan the QR code on the image he sent me below (click image to show larger version if needed) using your smart-phone with a suitable barcode-scanning app.
The QR-code contains an HTML link which is http://bit.ly/aefZn7 which gets converted by bit.ly into
That page is a deep link into our Tesco Entertainment site that enables you buy the game direct from Tesco. It's great to see QR-codes make the light of day at Tesco!
UPDATE: You can find out how many times that the HTML link has been followed by clicking this link! (Hat tip to @edent on Twitter)