Air South
I did my PPL with Air South between Nov 1991 and Jul 1992. I seem to recall that they merged with Southern Air a few years later. I dropped in to their new office at that stage to get my logbook signed off for Certificate of Experience.
Googling John Pothecary gives a link to the Moth Club and Old Sarum Engineering. I think John & Jenny moved to Old Sarum after they left Air South.
Safe Flying,
Richard W.