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Thanks for all your suggestions. It definately wasn't 'That Darn Cat' or 'The Three Lives of Thomasina', and I'm not sure about Bond Street as although I can find it listed on the International Movie Database it has no information about the film itself.
From what I remember of the film is a bit sinister, and there's lots of shadowy scenes through gaps in doors, and through windows. It must be some kind of old horror/thriller type film. I just remember I really liked it and i would love to try and get hold of it again.