All electronics (and most other goods) purchased within the United Kingdom are covered with a minimum 1-year warranty from the retailer/manufacturer, as imposed by being a member state of the European Union. The manufacturer may also have their own warranty terms, but you are guaranteed at least a limited 1-year warranty. The one year warranty applies to the customer/buyer for free, without any extra charges.
The "warranty button" on Amazon which charges additional funds are most likely to increase your limited 1-year warranty.
You should be able to get a warranty from Amazon or AMD.
All the best.