Indeed, back OT to Viscounts lol - Channel Airways leased some of their -V700's to BKS in 1967.
BKS went on to have 6 x V806's from BEA from 1968.
And of course BKS Engineering was for many years done at their own Hangar at Southend.
Interesting you noted that the Avro 748 seats of 44-48 was a 'Coach load' - never thought of that.
Although when the bigger Viscounts took over some folk would have booked 'stay put' holidays,
and some may have chosen the Rail option to continue on from Ostend or Basel to say the Tyrol, or Venice by Continental Rail.