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Nice one, John! A couple of us have looked for this in Yorkshire unsuccessfully until this week, when we found it to be widespread along the Pocklington Canal. But you were there first...the first Yorkshire record!
My Flickr photos...
Thanks. I didn't realise it was new to Yorks. I'll give myself a treat.
Lat/Lng: 53.9192, -0.3311
OS grid ref: TA097482