I certainly can't claim to be a car expert, but I always find it curious when I come across a car manufacturer or make I've never even heard of before. In this case it's the Dyna Panhard. On researching I found out that in fact Panhard is one of the world's oldest car manufacturers, founded in 1891. The Dyna was produced between 1954 and 1959, with 140,000 models being produced. I don't know how many of these made it over to the UK, but presumably some did given that the advertisement boasts Now with right hand drive.
Vintage advertisement for Dyna Panhard, Motor Sport magazine, c.1958