Jimmy Neighbour's team beat Millwall 3-2 on Saturday morning while rivals Arsenal suffered a 2-0 loss against Bristol City.
That defeat completed Arsenal's fixtures and left us two points ahead with a game remaining.
Michael Malcolm bagged a double and Mark Yeates the third goal in the crucial win against Millwall.
The play-offs are next while a number of the U17 players will be involved in the FA Youth Cup quarter-final against Blackburn Rovers at the Lane on Tuesday March 12.
We will have more reaction to the U17s triumph next week.
Our Under-17s clinched the FA Premier Academy League on Saturday.