Do the 757s not have Finnair flight crews (and UK-based Air Scandic cabin crew?).
Finnair do many huge charters with these aircraft in the winter, which like in Canada is their high season for the IT business. They have virtually daily fights from Helsinki to Thailand resorts (Phuket, Utapao), refuelling en-route at Ahmedabad in India, and also several flights a week to Brazilian resorts (Fortaleza, Recife), refuelling in the Canaries, along with a lot of straightforward Canary Islands round trips, which are a LONG way from Helsinki ! So the crews are used to it. But as for the pax .....