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A key factor in putting a name to any leaf miner is to identify the plant. "Doc leaf" is mentioned, so it is unlikely that this is Phytomyza plantaginis, which feeds on a plantain species. Have you got a picture which shows a little more detail of the plant?
I am very new to this and very much appreciate your advice. I will re submit additional photos for your examination.
Thank you, Martin.
Lat/Lng: 52.5698, 1.6684
OS grid ref: TG486032