You should probably do a little research or see if your local trading standards do any sort of education classes on consumer protection law.
You seem quite confused with warranties and statutory protection which are completely separate issues.
The 2 year EU Directive was actually not fully implemented in the UK, mainly because the Sale of Goods Act has been offering a similar protection since 1979 and allowed you to take action for up to 6 years. These consumer protections are nothing to do with warranties.
Fit for purpose is a SoGA term, and is another separate issue, more to do with the purpose you buy an item for, not what you think it does, the part of SoGA you are thinking of is "durable quality", which is unfortunately subjective and would need to be proven in court to rely on it as a protection.
A warranty is in addition to any statutory rights, from Apple, it is 12 months, from John Lewis is it 24 months (the warranty is a contract issue between you and the retailer with who you formed a contract), Apple go beyond their legal requirements by offering their 12 month warranty no matter where you bought the item from.
Please don't post the "24 month EU warranty" myth again, it just confuses the entire issue and has no factual basis.