Acton to Ealing is a couple of miles, so it would be possible to walk and people did walk more in those days .... however, being a baker, and if he had his own shop, would you think that he might have a truck or van (or cart?)? (for deliveries etc)
It also depends on the time line. He lived in Southfield Road in 1939, but where did he live in 1946 when John lived in Ealing?
I wonder if electoral rolls might help trace their movements?