Just found this when went through my account. It's handy when you need spend on Amazon anyway, that's 5% cash back if you top up £100. It's only valid once tho and may be selected account only.
What is Top Up?
When you use Top Up, you are effectively purchasing an Amazon.co.uk Gift Card that is automatically added to your Amazon.co.uk Gift Card balance. You can directly and instantly top up an amount of your choice using a credit or debit card. You can also set up Auto Top Up, with the option of scheduling a Top Up on a regular frequency, or adding funds automatically when your balance drops below a selected amount.
Try Top Up today and get an extra £5 when you Top Up £100 or more.
To enjoy this special offer, you must:
(1) be the recipient of the corresponding offer on Amazon.co.uk,
(2) click the button 'Click to qualify for the Top Up reward’ below to see if you are eligible for the offer,
(3) Top Up £100 or more in a single order on Amazon.co.uk.
We'll automatically apply the £5 reward to your Gift Card balance and confirm by e-mail after your qualifying Top Up order has been processed.
Step 1: Click the button below to see if you are eligible for this offer.
Step 2: Top Up your Amazon.co.uk account with £100 or more in a single order.
voted HOT as others can get a free fiver :)