This is a heads up and deal may not materialise so have put in misc for the moment until is confirmed.
On the Amazon site I have seen a banner advertisement for £5 off £10 @ Amazon using your MasterCard.
Edit 19:44: Now confirmed and moved into deals. Enter MCARD5OFF at checkout (credit solonely)
MUST BE ITEMS SOLD AND DISPATCHED BY AMAZON :)
NB - Only enter the code when you reach the final "Confirm" page (i.e. the page AFTER you have selcected Mastercard as your payment method)
1p sim cards don't work to top a £9.99 up to £10 as they must be sold and dispatched by amazon themselves.
Terms and Condition
1. Subject to these terms, the Code entitles you to a £ 5 discount that can be used on http://www.amazon.co.uk
towards the purchase of all items sold and shipped by http://www.amazon.co.uk
(and not towards purchases from third-party sellers) excluding baby formula, digital products, gift cards, and shipping and handling charges (the “Offer”). Amazon reserves the right, if deemed necessary, to exclude some items from the Offer at any time.
2. The Code must be used for a single purchase. The Code can be redeemed only once per customer.
3. The Code must be entered in the “Enter a gift card, gift certificate or promotional code” box on the select a payment method page during the check-out process on http://www.amazon.co.uk.
4. You will be responsible for payment to Amazon for final price of the purchase after the £ 5 discount, plus applicable taxes.
5. The Offer will expire when the promotion budget will be used up or on 31 December 2014 at the latest. The Code can be redeemed on http://www.amazon.co.uk
until 15 January 2015. After redeeming the Code, the £ 5 discount will be automatically applied to your eligible purchases. If you do not purchase the eligible item(s) added to your Shopping Cart when the Code is in effect, you will not receive the £ 5 discount.
6. The Offer does not apply to purchases made from third party sellers on http://www.amazon.co.uk’s
Marketplace Platform or at any of http://www.amazon.co.uk’s
Trusted Partner sites, or from any other Amazon website (www.amazon.com, http://www.amazon.de,http://www.amazon.es,http://www.amazon.fr,http://www.amazon.co.jp,http://www.amazon.cn,http://www.amazon.ca,http://www.amazon.it
7. The Offer is available only to customers located in and with billing addresses in the United Kingdom who have a MasterCard credit card associated with their http://www.amazon.co.uk
account and who select their MasterCard credit card as method of payment. If for any reason your MasterCard credit card is inactive, denied or ineligible, you will not be able to use the Code.
8. Canceling eligible item(s) may affect your eligibility for the £ 5 discount.
9. If you violate any of these terms, the Code will be invalid, and the £ 5 will not apply.
10. The Code is non-transferable, non-exchangeable, and not redeemable for cash, is void where prohibited by law and may not be combinable with other credits or special offers. This Offer applies only to persons that are over 18 years old.
11. You must have a http://www.amazon.co.uk
account and accept the http://www.amazon.co.uk
Conditions of Use & Sale, Privacy Notice and Cookies & Internet Advertising to redeem the Code.
12. Amazon, Amazon.co.uk, and the Amazon.co.uk logo are trademarks of Amazon.com, Inc. or its Affiliates.
13. We reserve the right, in our sole discretion, to terminate or modify this Offer at any time. The Code may not be applied to orders already placed with http://www.amazon.co.uk.
14. When you redeem a Code, Amazon may be able to tell that you are part of a select group of customers. For more information about data that Amazon collects from its customers, read the http://www.amazon.co.uk
Privacy Notice located at http://www.amazon.co.uk/gp/help/customer/display.html/ref=gss?nodeId=502584
You can apply this £5 off code to £10 off £30 offer on DVDs, Books, & CDs sold by Amazon. For example I paid £15 for £30 worth of these DVDs with free next day delivery with Prime:
-Live Die Repeat: Edge of Tomorrow [DVD]  at £10.
-Captain America: The Winter Soldier [DVD] at £10.
]-Maleficent [DVD] at £10.
"Three for £20: Books, CDs and DVDs Offer
This title is in our Three for £20: Books, CDs and DVDs promotion. Click here to see the full range. Offer only applies to Qualifying Items purchased and dispatched from Amazon.co.uk at the website http://www.amazon.co.uk.
It does not apply to purchases made from third-party sellers at Amazon.co.uk’s Marketplace platform
Special Offers and Product Promotions
•Buy 3 items from the qualifying selection for £20 when dispatched from and sold by Amazon.co.uk Here's how (terms and conditions apply)
•Bag a bargain this holiday season from hundreds of top titles in our Christmas Deals Promotion. Offers end at 23:59 on Sunday, December 21. Find more great prices on DVD and Blu-ray Bargains.
•Find the perfect gift for movie fans and telly addicts with our DVD & Blu-ray Christmas Gift Guide. From the biggest new blockbusters to festive favourites, there are plenty of present ideas for any budget. "