Most people think they have a legal right to return a faulty item and get a refund. You don't. The Consumer Rights Act 2015 gives you 30 days to reject something that is faulty, not fit for purpose, or not as described. After that, the seller gets one chance to repair or replace it. If that fails, you can claim a refund or price reduction.
The 30-day clock starts from the day you take ownership. Not delivery. Not when you first use it. If you buy a sofa and it's delivered on the 1st, you have until the 31st to reject it. Miss that window and you lose the right to an automatic refund.
Online purchases are different. The Consumer Contracts Regulations give you 14 days to change your mind on almost anything bought remotely. No reason needed. But there are exceptions. Custom-made items, perishable goods, and sealed software or audio products once opened are not covered.
What catches people out is the burden of proof. In the first six months, the law assumes the fault existed at the time of delivery. After six months, you have to prove it did. That means keeping receipts, photos, and any correspondence with the seller.
The system works if you act fast. Delay and you lose leverage.
Paul