By 1940 with the rapidly increasing development of large-span bomber aircraft, it became obvious that the pre-war standard RAF transportable hangar known as the Bellman Shed was rapidly becoming obsolete. As a result, the Air Ministry in collaboration with Teesside Bridge & Engineering Ltd, developed a series of end-opening hangars known as Type âTâ. The first design was the T2 and like the others in this family it is built of a series of standard steel-fabricated lattice wall and roof units of welded-and-bolted construction. The complete framework is clad with galvanised corrugated iron, 22-gauge for the roof and 24-gauge for the walls. T2 were designed by the architect AE Cotton.