Hebburn lost 1-0, so it comes down to the final day. Hebburn away to 11th placed Sheffield FC, Stockton away to 7th placed Belper. Belper lost 3-0 tonight (and now can't make the playoffs) and they play again on Thursday, so that might impact them come Saturday.
Dunston and Pontefract both won tonight (Dunston won away at Carlton), so they will play each other in the playoffs, but the venue TBC - not sure if Dunston are back at their own ground yet? One of Stockton or Hebburn will be at home to Carlton, and the other promoted.