Thanks for the link!
I think it is the one I'm searching since years.
When I was kid I saw on TV a very good car chase, I never found it again.
I don't know how I missed it on the site, since I think I already searched for the Triumph Herald: when I was kid I had a Dinky Toys Triumph Herald whose side was damaged in a way like if hit rocks on the side of the road, so I was often making chases with it. Funny that it was actually the right model (I thought it was just a vaguely similar car)