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It's never up to the maker to fix it. Your relationship is always with the retailer. After six months you need to be able to demonstrate it was faulty when you bought it, which makes things harder.
https://www.which.co.uk/consumer-rights/advice/what-do-i-do-if-i-have-a-faulty-product-aTTEK2g0YuEy
Though given the only way to assert these rights is to make a fuss in the shop until they give in to make you go away, the letter of the law is not particularly important.
Your contract is always with the retailer and it’s up to them to fix the problem, either with a refund or replacement or organising a repair. They’re breaching the Consumer Rights Act by fobbing you off onto the manufacturer.