OK. I am sitting on the sofa posting this while watching a piece of highly intellectual television called “first dates”.
My notes say – flying in formation, almost stopping, upper slightly behind, synchrony in wing beats. Calling as flying “wowo woweee” rising on the last beat.
The upper sketch is of a female oystercatcher after coitus. The act itself lasted 30 seconds or so. I tried a couple of drawings to capture this from memory.
A bittern was barely visible in the reeds. The bloke who pointed it out to me had also caught on camera a pair of courting great crested grebes. I missed these. I focussed for most part on birds in flight, particularly catching them coming in to land.