BIGTHANKS
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 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), gift cards (Gift Card, Gift Certificates, etc.), and delivery and handling charges. It cannot be redeemed on products sold by 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 BST on Friday, January 22, 2016.
It seems like you need to spend at least £63 (not including shipping) for the coupon to work, because Amazon deducts 20% VAT from the price before applying any coupons.