Comment
The discontinuation of air filter fitment is a puzzle to me. My understanding of all the MEE tests that I've seen suggests no loss of performance or increase in fuel consumption. They were fitted to several small contracts, saw a certain amount of Home Service and then suddenly on the MoS listings for C9681 in early 1937..."Air Cleaners are not now required on the machines". No indication of who decided this, and why. There was obviously an extra cost. Perhaps they decided that it was no longer necessary for Home-based machines.
