I do not think the Steele Road you seek exists anymore due to rebuilding and road realignment. You can see it on the 1908 map, (click on link below). You will see it was sandwiched between Manor Road, Stephen Road and Eve Rd. It was on the Stratford/Plaistow borders and as Bill has already suggested, nearby Ranelagh School is the most likely school your father attended.http://mapco.net/bart1908/bart27b.htm
Thanks for the map link. I can see that the Ranelagh school was very close to Steele Road. My interpretation of the info on the Newham School Life page says that The School, originally called Napier Road Board School, founded in 1904, later changed its name to Ranelagh to avoid being confused with Napier School East Ham.
Thanks for your help