They could be the same birds, Stuart. 10 Black Terns arrived at Rutland Water on Sun 23 May ( as did the 2 WWB Terns ) but moved on and were not reported at all on Mon 24 May. Although the 2WWB Terns were reported (seen)on "Birdguides" on Mon 24 May at 07.00 and 11.00, the 4 Black Terns were not reported (seen)until 12.42. ( Your 4 at Bainton Gravel Pits (Cambs) having moved on from there at 10.00 on Mon 24 May). It looks as if the Rutland Water 4 Black Terns moved on again ,as they haven't been reported today (Tue), although the 2 WWB Terns were still around at 15.06.
Regards,
Freddy
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