I saw it yesterday. I quite enjoyed it, but thought that the religious symbolism was massively overdone, and the basic premise was flawed. Had I been Queen, I wouldn't want to be 'kept alive' in pain and in a very austere room for an extra 62 days, or whatever it was.
The relationship between Harold and David was never explained, which was a shame - I don't think there is a need for complete resolution of things like guilt, but there could have been more of a clue as to what went wrong.
It was well acted, and I liked the low-key treatment of English towns. It passed an afternoon, but I wouldn't rush to see it again.