There isn't a great deal to add although having spent some time with a lonesome male Grey Wagtail who kept calling I was fortunate enough to see him with his missus whereupon she threw her tail straight up and showed her rear end but I wasn't sure if this was 'I have a headache' or 'hello handsome', either way they the two of them went off their own way to feed. Maybe he said the wrong thing! And meanwhile I think I may have discovered a pair of nesting Long-Tailed Tits... not hopefull as the area they have set up home in is swamped by domestic cats. Despte all previous attempts probably my best images of these little gems.
If anyone KNOWS what is going on in this sequence I would be pleased to hear from you. Clearly she is displaying but is it a 'come on' or 'hello and don't even dare to think about it!' No mating took place. Maybe HE had a headache?