Over here in Ireland, I studied business for a while and I think it's quite similar in the UK.
What I learnt was that the warrantys companies provide you with are actually worthless. If Apple told you that you didn't have a 1 year warranty, but instead a 1 month warranty, then it would make no difference at all.
A warranty can only ADD to your rights, they CANNOT take anything away. By Law.
AFAIK, this means that if after 1.5 years your MacBook cuts out due to some manufacturing fault (the heat, fans, whatever) and you have NOT purchased AppleCare, then UNDER THE LAW Apple still have to fix it or give you a refund. Why? Because a laptop should not break after 1.5 years, simple as.
Trust me on this though - Most companies will do anything to avoid obeying this law, but keep pushing and they will HAVE to comply. I spent a month in a dispute over a mobile phone in a similar incident to this, and eventually backed down and just stopped bothering, I found out a month later talking with a Lawyer that I was in the right, and simply by backing down I proved why most companies, Apple included, will never obey the law - because most people don't have the balls to keep pushing for their rights.
That's in Ireland anyway.