When I started typing this I was going to say that you need to get an independant rating from someone like the AA.
However, looking at their rating criteria now which can be found here linky it looks like the standards are not as rigorous as they used to be.
Ok, it was ten years ago and my memory might be failing me but I am sure that when I looked these up before (in a book) then a hotel had to offer 24 hour room service to get 3 stars, a 4 star hotel would have to have to 24 hour front desk and a choice of restaurants.
It looks like the requirements are not as high today. Just about the same as everything else really.

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