If you live in the UK no dead pixel policy can affect your statutory rights unless it is mentioned or shown to you before purchase. This means unless you were told otherwise before purchase they must fix, replace or refund, your choice, any display that has stuck or dead pixels, or that develops dead pixels at anytime during the life of the product. Unfortunately that last bit doesn't mean you're covered for life, it just means an industry accepted amount of time, which is usually only a year for technology products.