I think this is the best offer on a Pro Xbox 360, which includes 2 of the best new games on the 360 including Halo 3 and Assassins Creed as well as Virtua Fighter 5 for £279 instore or online but if you use want home delivery, you'll have to pay for delivery and then use the 5% voucher code, making it just £270 including delivery.
The 3 games have a collective lowest price online of £88 total, so that means you're paying £182 for the console before Quidco even comes into play for the whole order, so I think that's a fantastic bargain for a quality bundle.
You can also go through Quidco to receive cashback of 2.5% making this just £263.25 all inclusive or if you can't wait, then it's yours for £279 today.
Hope that helps. :)