A fast start to the second half should have drawn greater reward for United, with Scanlon having a good shot saved, Dan Armer heading wide of the left post and substitute Jim Thwaites’s free-kick also squeezing wide.
Instead, it took until 72 minutes in for Scanlon to level the game, finishing well after fantastic wing-play from another sub, Lacey, on the right flank.
His fine contribution continued four minutes later with an excellent goal of his own. With several shots blocked around the edge of the box, Lacey showed good feet to find space on his weaker right foot and then strike into the bottom left corner.
It seemed likely to be the winner, but Derby found extra reserves of energy. Devaney put in a last-ditch challenge to prevent Allen netting on the counter-attack, but County couldn’t be supressed and levelled through Tristan Gill’s header shortly after.
United, then, had to find something more and did so in the second minute of injury time. Once again, Lacey was at the heart, playing a neat ball through to Tyler Fletcher inside the box. His run was well-timed, and his pull-back well-weighted. Musa finished well.