Okay, found the notes concerning the Indian AF visits ...
they started (at Northolt) in 1962, replacing Indian AF C-119Gs. They only ever used the two a/c listed above for the trip, except on one occasion (May '67) BG577 coded 'C' made a single visit. Their last visit appears to have been in late 1973 (I might be able to dig out exact dates?).
I was meaning to ask where the operated to/from en-route to Northolt, as I can't imagine they would be able to operate India-London non-stop. From the above messages they seem to have come via Paris/Orly and Cairo.
Further to the original post. I am 95% certain that Indian Navy Connies never made it to the UK, or London, or Northolt; but if anyone can provide a date when the saw one then I'm happy to be corrected.
(still trying to work out how to post a picture into this thread)