This was in Hanley, Stoke HMV. They didn't have the 360 GOTY but there were a few PS3 versions. They also had the standard version for the same price. I know there was a deal for it at WH Smiths but this should be available to more people so i thought i'd post it. Great price for students as well.
Call of Duty 4 GOTY £25 Instore @ HMV on Xbox 360 and PS3 (£22.50 after Student Discount)