Large cruiser enters lock followed by narrow boat
NB skipper appears to be a Neanderthal
Loses control of boat and manages to ram cruiser
Much shouting and waving of boat hooks
NB skipper manages to tie up his boat with considerable advice and help
Attempting to untie he loses contact with the boat which leaves the lock with his teenage daughter in command (she is screaming) while he clings by his fingertips to the edge of the lock with his feet in the water
He is rescued by the boat he has rammed and they set off up the river in pursuit of the now hysterical teenage daughter
I start filling in several different incident reports