Democritus.
You are talking about Sloane Aviation. They were the pre runner to Sloane Aviation. David George I believe also owned Sloane Aviation, but sold out and set up Sloane Helicopters several years latter.
Sloane aviation then became March Helicopters, Mike Smith and Archie Mc Kenzie.
I am afraid that I,m getting a bit long in the tooth for putting which years on these events.
Also sorry for the thread drift.