Seaboard and Western definitely was the original name of Seaboard World.
and Canadair CL-44 swing-tail freighters. Not a common sight in UK.
FT CL-44s were very common at Prestwick in the 1960's - almost daily.
The Flying Tigers CL44 into Heathrow (North) was the only one we ever saw there.
But BOAC leased Seaboard World CL-44s in the 60's, fully painted in BOAC colours. So they must have been pretty common at Heathrow.