WGC boss Adam Fisher certainly seems to be getting it right with his substitutions.
Three days earlier, he introduced recent signing Emmanuel Melford-Rowe to come off the bench to win a tight game with Hadley 2-1, with a header.
In this midweek clash at Broxbourne, having started with Melford-Rowe in preference to Jack Read, he brought on Read for the final 30 minutes, with the sides locked at 1-1 and the striker turned the game.
In fact, Read, replacing Ashley Kersey, and Melford-Rowe formed a deadly partnership in the last half-hour, to score one apiece and also fashion an own goal, to give the Citizens a final scoreline that was fully justified and lifted them to third in the table.
They dominated this clash with second bottom Broxbourne from the start, but having had a goal disallowed, hit the woodwork twice and had two cleared off the line, found themselves drawing with their lowly hosts with an hour of the game gone.
That forced Fisher to make his change and from that point, WGC ran away with the game and the points.
The Herns Lane side began strongly and inside five minutes, Luke Robins got a touch on a left-wing corner for an effort that went inches wide.
Inside a minute, marauding central defender Yasin Boodhoo brought a save from home keeper Graham Loki and on seven minutes, Boodhoo swept a header on from Kersey past the keeper and in, only for the effort to ruled out for offside.
On the quarter hour mark, Josh Bronti cut inside a defender and hit a fierce, swerving effort over keeper Loki that crashed against the crossbar.
From one of a succession of corners forced by WGC, defender John McGrandles hit an effort that struck the home team's Damien Thomas on the goalline, without the defender knowing much about it!
It was all WGC apart from a isolated free-kick that Broxbourne's Biramoha struck past a post midway through the half.
Another home free-kick that was allowed to bounce dangerously across the WGC area, brought keeper Jack Metcalfe to a full length save to tip wide before the WGC pressure was rewarded with an opening goal five minutes from the break.
Bronti played in a near post free-kick that Robins got a faint touch onto to divert it wide of Loki and into the far corner.
WGC began the second-half in similiar vein, Melford-Rowe making room for a powerful shot that just fizzed wide before the Citizens were rocked on their heels by a home equaliser 10 minutes after the restart.
Home skipper Robbie Carroll hit a long range, dipping effort in over Metcalfe from fully 25 yards, for 1-1.
This briefly buoyed Broxbourne who forced Metcalfe to another impressive full length save moments later.
Manager Fisher reacted and sent on Read for Kersey and within five minutes it sparked a second WGC goal.
Melford-Rowe got down the left, rounded Biramoha and fired in a low cross, that Broxbourne full-back Brook Couzins turned past his own keeper with Read lurking, on 65 minutes.
Three minutes later Melford-Rowe picked up in central midfield and made a deep run into Broxbourne territory before passing on to Read. Keeper Loki came out to block the danger, but Read neatly stepped around him and lofted an effort into an empty net for 3-1.
With the points secured, WGC reinstated their former dominance.
Taishan Griffith made a fine run forward onto a Bronti cross, but his final shot was blocked on the line and then Ben Long produced a peach of a pass to send Bronti through. Loki saved the winger's first effort, clawing away, but Bronti latched onto the rebound only to send his shot against the crossbar for the second time in the evening.
With 10 minutes remaining, WGC added a fourth in spectacular style from substitute Jay Welsh's near post corner. Melford-Rowe took off with a full length diving header to head powerfully home to give a final scoreline that WGC's overall dominance fully merited.
WGC: Metcalfe, Griffith, Boodhoo, McGrandles (Welsh 64), Brettell, Payne, Long, Robins, Bronti (Ward 81), Kersey (Read 60), Melford-Rowe.