Invicta Vanguards would have been leased or purchase from Air Holdings- they were traded in as some kind of exchange deal for L1011s (TriStars) IIRC. While it may have saved painting the Invicta Livery was very similar to Air Canada- a DC4 was recently posted here - a stroke of good luck. The Horse is of course the Invicta symbol with association with Kent (unconquered) and the airfield base - Manston. One Vanguard G-AYFN operated in a blue colour scheme ex Fly Trader of Sweden but was I think repainted into full Invicta livery later. CJ will no doubt be able to post a picture.
European Air Service France later received several Vanguards and also operated them in the basic Red/white scheme.