In 1971, the LHR to LAX service used a VC10 but it made a stop in New York along the way. It wasn't a non-stop sector. See:
http://www.timetableimages.com/ttima...71/ba71-13.jpg
I also had a look at an ex-VC10 Captain's logbook and whenever Los Angeles turned up in his log during the early 70s, it was a flight to or from New York.