Further to my submission on Friday regarding "Burnout Paradise" being £19.99 at GameStation (in their "Deal of the Week"), dogvilledan reported in the (above) thread that the same title was gained in a "2 for £30" offer yesterday.
Looking online at Currys.co.uk, the title is £19.97. It is temporarily out of stock, but can be reserved to collect in-store. Currys SKU code "838739".
It may be worth checking if you are passing a store to see what other titles are available in the "2 for £30" offer before committing to paying £19.97.