I had the pleasure of flying BKS DC-3 Leeds/Bradford- Ostend 1959 Robinson Tours (still going): 1961 Southend -Ostend DC-3 outbound, DC-4 inbound Co-op Travel Service; 1963 Manchester-Palma Aviaco (Iberia) Super Constellation Wallace Arnold; 1964 Gatwick-Lisbon Caledonian Airways DC-7C Wallace Arnold; 1965 Leed/Bradford-Ostend BKS Avro 748 Robinson Tours and finally 1971 Luton-Valencia Bristol Britannia Cosmos all jets after that.