I wouldn't buy a warranty, they're just wanting to charge you for a service that they have to provide by law anyway. Sale Of Goods & Services act states things should work and be fit for purpose and work for a reasonable length of time. I would have thought two years was well within what the law accounts for with a laptop. We once had issues with a cooker hood and the Citizens Advice thing told us the law allowed for faults up to six years after purchase to be pursued.