We watched this again last night - it really is a great film.
Hemel Pike is a canal-barge Casanova, aided and abetted by his illiterate cousin Ronnie. Hemel has a girl in every town along his route, and each one is intent on marriage. He is finally caught when one of the girls, Christine, falls pregnant.
Directed by Duncan Wood. Written by Ray Galton and Alan Simpson. Starring Harry H. Corbett, Hugh Griffith and Eric Sykes.