Rory Crisp produced a superb first minute solo try, converted by Chris Smith, before Crisp added a superb 30m drop goal.
Leading 10-3 at the break the old boys added another try through George Rogers before injuries, including a broken fibula for Crisp, meant a disjointed last 20 minutes. The old boys clung on for a 15-11 victory.
However, South Woodham's victory with a bonus point meant that the old boys will return to London North East 3 next year.