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I think it is G striatum. How big was it and have you a photo showing the underside of the spore sack?
No I haven't, I will try to pop out and get one! I'll take some measurements at the same time.
I took some more pictures which I hope are helpful.... They were no bigger than three or four inches across.
Lat/Lng: 52.7, 1.3
OS grid ref: TG2316