Just thought I would add my two pennies worth , but had to look up my log book first,
Last Sydney through the west that I operated was leaving London on the 17-7-74 and arriving back at London on the 01-08-74. The aircraft used though out the trip were both Standard and Super VC-10
Now I always thought that , at that time on a schedule basis Lax was a VC-10 destination whereas San Francisco was a B707 destination
Goodness me I just realised I am talking about a trip that took place some 44 years ago, surely I cannot be that old !!!!!!!