Per property bee
Actually I rang about this 2 weeks ago and was told it was sale agreed within a few thousand of asking.
I own in that cul de sac, in the last year or so another house went on at 750k, I am told no offers at all, after that another one went on at 690k and was taken off and subsequently rented out. I imagine that they might settle at 525-575. 20 has a nice bit of extra space which would give it a premium.