In reply to HeMa:
No, that's no correct.
The consumer rights act (replacing sales of goods act) says goods must be fit for purpose, and if not you have the right to repair, replace or refund and it is the customers choice. Any problem with the goods within 6 months of purchase is deemed to be a problem with manufacturing and the above applies. After 6 months the above still applies but now you have to prove it was a problem with manufacturing, which can be much harder. In all of the above your contract is with the seller and should be your first point of contact.
On top of this many companies offer an extended warranty, which is consumer protection above and beyond your statutory rights. So if you are out of the 6 month window and have a warranty it may be easier to approach the manufacturer rather than having to prove it was a problem with the manufacturing rather than mistreatment or wear and tear to the seller, who may not be an expert.
For example I have some Salomon boots that leaked like a sieve but only noticed after 6 months. I saw Salomon offer a 2 year warranty and got the boots replaced under that with no contact with the shop. This was much easier than trying to pursade a shop assistant that the boots were faulty not through mistreatment or wear and tear.
The important thing is you know your rights, and check what a warranty covers if you choose to get one or it is included with your purchase.