If you're spending £50+ (min spend £50.01) at Amazon you may as well get a £5 Gift Card by shopping via vouchercodes.
Extra bonus if you have the £5 Amex statement credit on £20 Amazon spend.
Will put the terms and instructions in comment 1.
Please note excludes gift cards purchase.
Edit 15th August 19:59: Also £5 PayPal Cashback on Orders Over £50 at Argoshttps://www.vouchercodes.co.uk/argos.co.uk