Med-fest continues and possible/probable Bonaparte's sighting

Heysham Obs
A rather frustrating morning as a small adult gull with white underwings and "quite a bit of summer head plumage"was located on the seaward end of Heysham one outfall on the incoming tide in association with adult Little Gull, at least one Med and Black-headed Gulls.  Unfortunately I was originally going to check from the north harbour wall which would have given the requisite views, but changed my mind and went to Ocean Edge -  a bit distant from Ocean Edge grass to be absolutely sure.    Any other birders around? Unfortunately, instead of switching to Heysham 2 as the tide came in, it flew along the tideline until lost, when it may have joined the wake of the incoming IOM ferry.  Had to move the car, increasing scope shake and couldnt locate.

Putative Bonaparte's Gull - see above - this sighting will not be claimed unless subsequently confirmed
Med Gull - 21 early morning at low tide, including a new darvic ring (white LC6).  This observer was concentrating on reading ring numbers, not searching for the Bonaparte's Gull.  11 adult, 2 3CY, 3 2CY and 5 juvs.  2P96 and AKRS also present.
Little Gull - ad seaward end of Heysham one outfall at least lunchtime, then fed on the sea between the two outfalls
Sandwich Tern - one