House Martins

Today I was down at Wicken Fen in Norfolk, chasing dragonflies. I failed miserably at this but was cheered to see quite a large flock of house martins settling and circling a large tree near the cafe area. They were a mixture of adults and juveniles and it seemed to be some sort of flying and feeding tuition programme. This little fellow kept trying to land on the same branch as his parent, only to be rudely pushed off again every time. Has anyone seen anything like this before?