Martin Samways, the president of Aslef, has resigned following his role in a fight at a union barbecue.

Samways, a left-winger who has been a member of Aslef for 40 years, quit after a report found his behaviour "wholly unacceptable".

He said: "I lapsed along with others and made a terrible error of judgment... I am big enough to admit my mistakes and to try and rectify that mistake by acknowledging that I should resign my position forthwith."