I don't remember any films being shot in London but when I was on the "Browning" in Seaforth Dock at what we used to call Siberia Wharf, (as it was so far from the gate) they filmed the "Boys from the Blackstuff" both on the quay and in the ship's hold.
We used to be amused that when actual cargo work finished a road sweeper tuck used to come and clean the quay. There was studio lighting all along the shed canopy illuminating the quay. They filmed several police car chases along the quay which were quite exciting at the time.
When they came to film in the hold, a gang of the smartest and cleanest looking "dockies" boarded the ship, in new boiler suits and shiny boots. The "cargo" being large empty cardboard cigarette cases. A large catering caravan was positioned behind the shed to feed the film crew and actors.
I remember being somewhat taken aback when going ashore to see several of the film crew snogging behind the sheds, both female/female and male/male who didn't seem too fussy which! They were definitely all "dearies"
When the episode finally went out, after about 3 nights "work" is was on screen for about 1 minute!
Cheers Fraser