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Unfortnately we can't see the all-important leg detail - yellow stripes or all black - but I'm inclined more towards Common Darter S. striolatum:
I'm afraid I would go for Common Darter too, if you view the image original size you con make out the yellow stripes on the forelegs.
Lat/Lng: 53.2708, -2.5184
OS grid ref: SJ655749
large park with river and several ponds - lots of reeds and plants/flowers.