Several posters have remembered that this song was used in a Wind In The Willows film (1996). It's worth noting that in the film, only one verse is sung ... and it's not one of the four verses written by Tony Hatch, but a new fifth written for the film.

Tony Hatch is rightly credited in the film credits for music, but the lyrics credit is given to Terry Jones (yes, that one), who penned this new verse:

There's plenty to do and lots of time too
Messing about on the river
Wherever you go, you go with the flow
When you're messing about on the river
Whether you get there, whether you don't
You think it would matter -- I tell you it won't!
Lots to be done, and it's all of it fun
When you're messing about on the river

Wind in the Willows film credits
Eric Idle singing Terry Jones' verse