To get this price you need a £10 voucher. There is one available if you go through quidco and that is guaranteed for a further 3% cashback on top of the voucher!
This is a better card than the Asus from Scan. The major difference between a 768m and a 1GB card is in the 768m version you get 192-bit of GDDR5, in this one it is 256-bit. This one has OCed to a higher clock than the 768M ASUS. In practice this should be slightly more futureproof and should perform similarly to a standard GTX465.
Personally I think it worth the extra £35 ish compared to the £123 [email protected]
. This is the cheapest overclocked 1GB GTX 460 from a decent manufacturer I could find.