Apple not respecting warranty

While your description would suggest otherwise, Apple would only normally withhold service if this issue was diagnosed to be due to damage or misuse.

If purchased within the UK, you will have benefit of at least a one-year manufacturers warranty - although consumer law provides for up to six years for manufacturing defects. That said, the onus is upon the consumer to prove that the defected existed at the time of purchase.

Don't forget, your warranty is initially with the retailer from which the item was purchased; Apple offer an additional manufacturer's warranty in addition to your statutory warranty rights with the retailer.

You also have additional protection if you purchased using a Credit Card (always advisable for high-value purchases) as your contract is with the Credit Card issuer. If you purchased using a Credit Card - and are unable to obtain satisfactory resolution with your retailer (Apple if purchased directly), contact your Credit Card issuer.