I saw in your list that you haven't got a film of a M.G. J1. Here a nice b/w sequence of this 4-seater M.G. in probably a Scandinavian language I do not speak:
http://www.youtube.com/watch?v=_LEEt-u4pGI

guymaathuis, certainly it would be nice to add the J1 you pointed . I've got the captures of this car but the problem is, from what movie is the MG? We have not the title.

They are talking in Swedish. The girl is referred to as Birgit and the car as Betty. The licensplate starts with M wich would mean that the car belongs to someone in Scania (Skåne) close to or in Malmö.

I don't know the movie nor the actors though I recognize the guy jumping in the car at the end. I don't think it would be to hard to figure out though.

The uploader of this youtube video is 'fymasmachines' and his last comment is "The car belong to me Even Ibsen - and was originally imported by my grandfather in 1932 as the first MG car in Denmark.
It is a model J1 - and not as stated by Mr. 1loosetooth a D - a D has straight doors and a smaller engine than the J1....."

http://www.youtube.com/watch?v=_LEEt-u4pGI