This worked for me, hope it works for you!!
Currys currenty have forza 2 on sale for £39.99
Argos have it on sale for £9.99
Take a printout of the webpage for forza2 @ Argos to currys and if currys have it in stock you will get it for the argos price plus 10% of the difference which is £3
The sales assistant did not even ring comet up
I also had PGR4 for £12.50 (Excellent Deal)