G-APWA and G-ASKK were both leased pending the arrival and introduction of Autair's Ambassadors in 1963. Autair's Ambassadors came from Globe Air who were part-exchanging them with Handley Page for Heralds. However delivery of the Heralds to Globe Air was delayed by manufacturing problems and thus the release of the Ambassadors from Globe Air was also delayed. Hence the lease of the Heralds to Autair as a stop gap.
G-APWB/C/D were purchased by Autair in 1966. Incidentally I spent several very happy hours joy-riding in the cockpits of these three aircraft on training details - ferrying AOG spares etc - before their introduction to passenger services with Autair. Happy Days!