Now, I have to confess that I wasn't reading a great deal at this age (long story, ask me and I'll bore you with it). But I do remember seeing this at the cinema AND reading the (very thin) book of the film too:
I loved Ray Harryhausen's jerky monsters in the film. They blew me away as a young boy and Tom Baker made a superb villain! To a young boy sitting in a fleapit cinema in Birkenhead, the settings seemed so exotic. Another world, really. I've tried to bring some of this world into grimy, Victorian streets of Mortlock's London.
This is worth a quick watch even if it's just for the mad voiceover!
And then there's the whole 'genie thing.' But I'll save that for next time!