Sutton Athletic confirmed a home play-off tie with a 3-1 win at Forest Hill Park.
The defeat for FHP means that they will finish in the bottom two, with only the FA able to save them from relegation now.
Sutton could be joined in the end of season promotion tournament by Snodland Town and Tooting Bec, who both picked up wins today. Bridon Ropes are the only other side that could still make their way into the top 5.
SC Thamesmead are up to 8th, after a 2-0 home win over Westside while Lydd Town were 4-2 victors against FC Elmstead.