Former Eastern, Conair, Atlanta Skylarks Boeing 720.
http://www.airliners.net/photo/Atlanta-Skylarks/Boeing-720-025/1239549/M/
Probably a Stansted regular in the 70’s.

Very many thanks for that link. We used to handle that aircraft in its a/s Conair colours and then Atlanta Skylarks. Another of those travel clubs that used to drop in were the 707s of Denver Ports Of Call. Atlanta Skylarks often used a Boeing 727-100 on transatlantic trips.