Here's a link to more information about this fascinating company, Instone Air. I first came across them when they brokered a dry charter of one of our aircraft to MAS in the late '70s. Their senior managers still looked and acted like a 19th century shipping line, which is what they were, of course.
Instone Air should be better known than it is, having achieved a large number of Firsts in the UK's aviation history, and still going strong.
Sorry; now back to the topic......................