Aspect Ratio
Interesting that IMDB has this as a standard 1.33 AR film at a time when virtually all A features were made WS. And this was an A feature in the UK, not a B as has been suggested elsewhere. I wonder whether it is another open matte print that was masked for Ws showing in cinemas. I'm going to make myself a masked widescreen version from the 4:3 DVD with Virtualdub and see how it looks!
Edit: It does mask well to 1.66:1, with no heads cut off or whatever, so I think it was indeed shot open matte aiming at WS cinema prints.