Good shout, given you're from New England

. The UK law under SOGA (Sales of Goods Act) is that goods must be fit for purpose, and be of satisfactory quality.
So, for instance, your £1700 Retina Macbook fails 1 month out of warranty. Would a reasonable person expect a computer of that cost, and advertised quality, to last more than this period? I think most people would say so. Therefore you approach the retailer stating you wish to make a claim under SOGA.
This leaflet is a great source of info:
http://www.oft.gov.uk/shared_oft/738369/738375/OFT002_SOGA_explained.pdf
Note, I would not recommend going in all guns blazing, and would first approach a kindly apple store genius by way of an appointment, as they may assist without the hassle. And remember not to get aggravated with the person(s) in store, it won't help.
Good luck!