Bird, The MG Midget had contrasting color on the seat "trim" (don't know the term but it is the little tube of material between the seat bottom and the seat sides.) The Midget, of course, had the MG Octagon Badge. IT had a fancier dash too. IT had a chrome strip down the side of the car which the AH didn't have.
A little chrome, a little contrast in the upholstery, and of course more $. There were different levels of quality for side curtains. Some were steel frame with canvas over it and pretty chintzy slide action. I had come aluminum framed rubber gasketed ones with sliding Plexiglas windows. They still flapped "their wings" a bit at high speed and werre not entirely weather proof.
My wife drove the '59 MG 15 miles one way to work for her 4 to midnight shift at the hospital at Minot, ND. With no heat and the drafty cockpit she got chilled in the winter and was so glad to change jobs, work regular daytime hours, and not have to leave the airbase in that drafty frigid conveyance. OF course it was fun in the summer, both weeks.
The '66 Sunbeam Tiger (Ford V-8 powered Alpine) had a heater, rollup windows and was quite tolerable in a NoDak winter but you had to be light on the accelerator on ice as the 165MPH capable beast wasn't easy to drive on ice at slow speeds.
Pat
Pat