An even more complicated situation arose with the Leeds-based operation Tramway Supplies Ltd. They tendered for complete vehicles and then subcontracted the chassis supply to one manufacturer and the body supply to another. One of the body subcontractors was the Blackburn Aircraft who also had a factory in Leeds. They built their last bus bodies in 1924, just as Government orders for aircraft (particularly flying boats, a Blackburn specialty) began to pick up. Railless Ltd (the third Railless company) were, incidentally, backed by Short Brothers another aeroplane manufacturer with a specialism in flying boats and a sideline in bus bodies.