I would certainly say that a tv from a quality manufacturer should last longer than 15 months, and I'm sure there's something in European law about 2 years, but I'm not 100% certain on the details.
Someone who will know will be on here soonish, so don't rush into a decision over the next few days.
For future purchases I would recommend buying from John Lewis or Richer Sounds, as you get a 5 year warranty. Saves a lot of hassle and money in the long term.