The Scarp that got destroyed was mine.
At the time it hadn't be fully pitched, I was in the process of doing so when gust hit.
I was on my knees, about to put a peg in ground, the gust blew me to the ground and ripped guyline from my hand so hard it cut in to my palm.
I don't know what the wind speed was but having been out in winds of 70+mph, I reckon was at least 70mph, straight on to side of tent, not the rear.
I'm not too sure any 1 pole tent would have stood up in those conditions.
I think the only reason Stephen's did was it was fully pitched and mine acted as a wind break, even with the addition of extra guylines, at times it was near 'touch and go' that Stephen's was going to stand up to winds.
Paul.