I've had Amazon refund me even a full year after purchase, no problem. Basically you go on chat, say you have a problem with some item, they say "please contact manufacturer" to which you say "I'd like you to resolve this problem under the consumer rights act as you are the retailer who sold me this product" and 10/10 times they just go "ok, would you like a refund or a replacement". Then I have the refund 10 minutes later. I've had hundreds and hundreds of orders from Amazon in the last few years and this hasn't failed me once.