Yes Nush! :--)Leytonstone?!
It was Gone With The Wind in the US, but I doubt that movie was as big a hit in England. Maybe Bridge On The River Kwai?
I am thinking of a British film.
Perhaps a Bond film?
Jaws or The Godfather maybe? They were both big worldwide. Not sure about UK specifically though.
And it was definitely a British film that held the UK box office record prior to Star Wars? I'm struggling to think of a huge British film pre-1977 that would have held the UK record over the various massive US films that would have been big here too...Which film held the box office record in Great Britain before Star Wars broke it in 1977?
Whoever it knocked off top spot, it happened in 1978!
A WWII propaganda film?