"WHBM" - Thank you!
"Wayoutwest" - I imagine that the services to Frankfurt and Zurich were the first legs of routes to India, the Far East and Africa. BOAC also flew to Rome. Until 747-236s were introduced (which could fly to places like Bombay nonstop) this continued; indeed I flew London-Frankfurt-Delhi-Kuala Lumpur-Hong Kong as late as August, 1978 and Singapore-Bombay-Frankfurt-London in April of that year (both on 747-136s).