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Thanks, Cerigait. I have a feeling that I've actually got two different types here - the first two photos are Hedge Bindweed, as you say, but might the other one be Large Bindweed? They were taken at two different locations in the same country park, the last photo being of flowers which were high up, but were quite large. My reference book says that in Large B. 'the 2 epicalyx bracts overlap one another', which they seem to do where I can actually make them out! If you agree, maybe I should re-submit them as two separate entries.
Thanks for your help.
... looks like an obvious Calystegia silvatica. I'm failing to visualise the first two photographs in 3D, so I'm uncertain as their identity.
retake them both with close-ups of the calyces - agree third is silvatica, others may be too young to tell but not sure
Lat/Lng: 53.609, -2.30277
OS grid ref: SD800125