I'm sorry about the quality of the pictures - I was just changing lenses to my macro when it flew off... I can't find out which one it is.
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I agree Ephemera vulgata I think it is a subimago (dun)as it has heavy venation of wings and I think it is female as I cannot make out large compound eyes of male
Lat/Lng: 51.79377, -0.0029
OS grid ref: TL378124