This is the Lawson Neracar made in the late 1940s by combining a 4 cylinder in-line Blackburne engine with a Neracar chassis and adding some beautifully flowing home-made bodywork. Compare and contrast with the more boxy Avro Monocar made two decades earlier. There was a whole article about this machine in one of the weekly motorcycle magazines of the day, which was re-printed in Classic Mechanics in the 1980s. PNB