This is valid on a spend of over £50.
It just worked for me on some shoes :)
How to Claim:
Add any Qualifying Items with a combined value of £50 or more (the “Minimum Purchase”) to your Shopping Basket via the “Add to Basket” button. You cannot use the 1-Click ordering method when redeeming a promotional code.
When you’re done shopping, click the “Proceed to Checkout” button.
At checkout, enter the promotional code (BIGTHANKS) in the “Gift Cards and Promotional Codes” box. The Offer will then be applied to your order, reducing the cost of your total order value by £10.
Spend £50 or more in a single transaction (on a single item or on multiple items) dispatched from and sold by Amazon at the website http://www.amazon.co.uk
(“Qualifying Items”) and £10 will be deducted from your total order value when you enter promotional code BIGTHANKS at checkout (the “Offer”). This Offer applies only to products dispatched from and sold by Amazon, excluding baby formula, digital products (Audible, Digital Documents, Digital Video Download, Digital Music Service, Digital EBook Purchase, Digital Software, Digital Video Games, Mobile Apps), alcoholic drinks, gift cards (Gift Card, Gift Certificates, etc.) and delivery and handling charges. It cannot be redeemed on products sold by Amazon US or Amazon.co.uk Marketplace platform (including items Fulfilled by Amazon), at any of Amazon.co.uk’s Trusted Partner sites or at any other Amazon site, for example Amazon.com, Amazon.de, Amazon.es, Amazon.fr or Amazon.it. Each customer may claim a maximum of one Offer. This Offer cannot be used in conjunction with any other promotional codes or on any pre-existing orders. This Offer ends at 23:59 GMT on Friday, 20 January, 2017.
Ensure that you have £50 or more worth of items sold and dispatched by Amazon in your basket. Items which are sold and dispatched directly by Amazon.co.uk can be identified by the message "Dispatched from and sold by Amazon" on the product detail page. Please note that items described as “Dispatched from and sold by Amazon US” are not sold and dispatched by Amazon.co.uk and are therefore not eligible for this Offer.
Stacks with the student code "apprentice10" (need a prime student account)
If you have AMEX Gold or Platinum, use AMEX16SWP voucher to get £15 off at checkout when you spend £25 and pay a portion of your order with Reward points. You can pay £0.01 = 2 Reward Points to activate this offer
2nd code stack (auto applied)
Amazon Prime Members save £10 on Orders of £50 or more on Clothing & Shoes for Babies & Kids, Compliments of Amazon Family. https://www.amazon.co.uk/b/ref=amb_link_233465907_1?ie=UTF8&node=12414836031&pf_rd_m=A3P5ROKL5A1OLE&pf_rd_s=qpe-title-tag&pf_rd_r=ZZTP2DVWHQG50F8D64K4&pf_rd_t=201&pf_rd_p=1214798807&pf_rd_i=B01G3QGS3M