Talking of old tech - the car is a long-gone marque called, believe it or not, a Goggomobil
I've never heard of that before, but my mother did have a NSU Typ 110
for a period, and it was one of the first cars that I drove as a learner driver. Better known for manufacturing motorbikes, NSU cars were known for their unreliability. I think rather than unreliable, they were just difficult to find anyone in the UK to repair them when they did break, and they all had unusual engineering in their clutch and suspensions. The Typ 110 also had the engine at the rear of the car.
But your point about driving speeds in London (or any city with old street layouts) is one that puzzles me. Where are all the small cars (and vans) in London that you see in other European cities with tiny medieval cobbled streets? We do have many cities and towns just like that in the UK, and it would make sense for deliveries to be made that way. Instead, the street is invariably blocked by some artic delivering to a local supermarket, while a line of SUVs, that take up the entire width of the alleyway, are stuck trying to get past, with pedestrians risking life and limb to get by.