That should narrow it down a bit, but doesn't ring any bells with me. Maybe one possibility from what you describe is one of those spinoff films from TV sitcoms??

The latter. They landed in trash perhaps and were finally caught so to speak.
An English film from mid 60s to mid 70s.
Unfortunately that is about all I remember.

Any other clues - for example was film British or European or American? Comedy or thriller? What happened - dramatic car chase? big explosion with people killed and barge sunk or a gentle landing in a pile of sand so nobody got their feet wet?

I’m Glad I found this cool site. Main reason I watch a lot of old movies is for the cars and town scenes.
When I was a kid I saw a movie.
At the end of it the characters drive a mini off a pier and into a barge.
That's about all I remember of it. I re-watched the old Italian Job but that of course is not it.
Tried your site and the web.
Hoping a member might know of it.
I could step through all your sites hours but thought I would ask instead.
Thanks