just my 2 cents, but... a friend of mine had a terrible experience with john lewis after his mac misbehaved. they refused to accept the mac was faulty and after receiving video proof they suggested it`s an apple problem not theirs, this might have been an isolated case but still, their attitude sucked and it took about a year to resolve... personally i would avoid department stores for computer shopping
This is one of the very reasons why I and some others on here always by direct from Apple. However, if this is what your friend was told, then that would be breaking the law. The point of purchase IS liable in the first instance and can never abdicate from their statutory obligations.
1) Always pay by c/card (then the credit card company becomes jointly liable)
2) If you run a company and are not VAT registered, or are on the flat rate VAT scheme, consider purchasing as an individual and then claim the money back from the company. Consumers have additional rights to companies.
3) Buy online or over the phone, rather than in store from a reputable company. This way you are covered by Distance Selling laws which allow you a seven day grace period in which to confirm that what you have purchased is suitable for your needs. You are not afforded this protection if you buy in person.