Seems a very good deal, this is the cheapest I can find a decent 4k tele and you can also claim the free Multiroom Hub whatever that is.
Claim 6 Months FREE Deezer Music & 12 Months FREE Mubi Movies worth £96
Plus FREE WAM250 via Claim
The next best is John Lewis if you want 5 years warranty, but it is for £599 and I don't think they have this free Multiroom Hub on offer.
This Ultra High Definition 4K Smart LED TV produces the brightest, clearest images with four times the detail of Full HD to deliver an amazing viewing experience. Colours come alive and images look naturally vibrant, as everything shown on the screen is expressed with brighter, richer tones.