It was hoped that the Trago Mills SAH-1 would be sold as a military trainer to replace the then ageing "Bulldog" fleet.
;Bulldog Series 1: One prototype built by Beagle Aircraft (G-AXEH), one built by Scottish Aviation; now in the collection of the National Museum of Flight at East Fortune, East Lothian.
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It was used extensively by the Royal Air Force as a basic trainer, in particular as the standard aircraft of the University Air Squadrons and, later, Air Experience Flights, providing flying training.
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The Derby Aero Club and Flying School operates a range of Cessna Aircraft (Models 140, 152, 172, 177RG), a Beagle Pup series 2 and a Scottish Aviation Bulldog aircraft.