I only did one trip in a shed from Edinburgh to Leeds Bradford on a very cold winters Thursday night, in around 1995 (It was for an evening interview). The return was the following morning at some ungodly hour, and the Shed was freezing, with a large air blower piping warm air into Pax cabin. Both flight were in cold stable air, and at relatively low level, so nice views of cars on M6 on the way down and early sun rise over Lake District / Borders on return. Had to drive back South following evening, but got the job so hence my clear memory of my Shed experience, but can not remember the carrier, but it was an odd one maybe Gill Airlines I am not sure, and a Wiki search did not help either.
Cheers
Mr Mac