I'll post the google/ai summary, but this mostly it:
Your Main Rights by Timeframe Within 30 Days: You have the right to reject the item and get a full refund.
After 30 Days and up to 6 Months: You must give the retailer one opportunity to repair or replace the item. If that repair or replacement fails, you are generally entitled to a full refund. The law assumes the fault was there when you bought it unless the retailer proves otherwise.
After 6 Months: You can still request a repair or replacement, but the burden is on you to prove the fault was present when you received the item. You have up to six years (five years in Scotland) to bring a claim for faulty goods in court.