Hi All,
While looking for something completely different i stumbled on this ....

Description:
Shots of the numerous steamers sailing up and down the Clyde during the years 1931-1939. [Part of a collection of films taken by James Marshall of the Glasgow family-owned firm "Marshall's Semolina"].

Link -
http://ssa.nls.uk/film.cfm?fid=2574

Enjoy ...
Regards,
Kim