Bonnyrigg throw away three-goal lead at Bo'ness
The BUs fought back through Calum Scott, Will Snowdon and Marc Kelly.
Bonnyrigg sit eight points clear of second-placed Linlithgow with four games remaining. The Prestonfield men have five games left.
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Hide AdMusselburgh Athletic, who will switch to the East of Scotland League next season, have one hand on the Premier Division trophy after nearest rivals Fauldhouse United drew 3-3 at home to Haddington. Musselburgh, who host Dalkeith on Saturday, require just one point from their remaining four games.
Linlithgow, meanwhile, were bundled out of the DJ Laing East of Scotland Cup at the quarter-final stage, losing 4-3 on penalties at home to Tranent following a 2-2 draw.