http://www.canon.co.uk/powershotpromotion/

To claim your cashback, simply purchase your camera, complete the claim form and send it back to us, together with your till receipt. We will send you your cheque within 28 days.
But remember the cashback offer is only available on Canon PowerShot cameras purchased between Thursday 23rd August to Tuesday 28th August.

* PowerShot A550 = 30
* PowerShot A560 = 40
* PowerShot A570 IS = 50
* PowerShot A720 IS* = 50

The PowerShot A720 IS is only available in Jessops.