I'm guessing a hillclimb special, although the construction appears to be rather heavier and stronger than would be required. Parts of the frame appear to be from a mid-1930s American Ford. The driveline appears to be closed back to the differential, where I'm guessing a stub-axle is fitted with a chain drive to the back wheel, which may be of motorcycle origin. The engine appears to be an inline four. The radiator shell may be from a Morris Cowley.