Hertfordshire Notes:
Absent. A report from Hatfield is now known to be erroneous.

Middlesex Notes:
Evidently very local, with reports from Buckingham Palace garden in 1997, Stoke Newington in 2010 and Barnet from 2010 to 2019. Likely to be overlooked elsewhere.

Recorded in 3 (7%) of 41 10k Squares. First Recorded in 1997. Last Recorded in 2019. Additional Stats

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