Approx 20mm long.
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Thank you very much... I was completely stumped!! ... Yes, have read up on this now, and you are both correct.
If you get a photo from above, they are quite easy to get to species. This site summarises the detail...
My Flickr photos...
Lat/Lng: 52.190522, -1.7317123
OS grid ref: SP184547
Anne Hathaways Cottage, on Sweetcorn plant