WGC now hold the biggest lead they have had since hitting the front in the SSML Division 1 promotion chase - 15 points.
The Citizens stretched further away with a hard won win at Chesham United Res, coming back from 2-0 down take the points, against a home side reduced to 10 men for the whole of the second-half.
That followed teenage forward Jack Westlake's dismissal for kicking out wildly at WGC midfielder Daryl Smith a minute from the break and just 30 seconds after referee Russell Howes had warned both players, following a tussle.
The opening 20 minutes of this encounter was totally forgettable with neither side having anything resembling a chance until the 22nd minute when Chesham Res took the lead in the game's first serious attack.
A long ball over the top catching out the WGC defence and home forward Reece Cameron took it on, scuffing his final shot, but it still had the power to beat Joe Croft in the WGC goal.
WGC replied by creating a shooting chance for Craig Arnott, but his edge-of-the-area effort was blocked and Arnott hurt, an injury that troubled him until he was replaced in 67 minutes.
Eleven minutes after the opening goal, Chesham Res doubled their lead with a second from a penalty. Sean Brettell was caught out by a long, diagonal ball and as the speedy Eman Rowe outpaced him, Brettell brought the winger down. Cameron stepped up to net his second from the spot.
WGC had to reply quickly and they did, within three minutes, Joel Norris collecting and turning to get over a pinpoint cross that Marc Arnott met with a diving header into the far corner.
Chesham were then reduced to 10, but made a bright start after the restart and Rowe's pace saw him leave Smith trailing to set up midfielder Jack Hunt, but the outstanding Yasin Boodhoo got in a goal-saving block.
On the hour, Norris was fouled 20 yards out and took the kick himself, driving it hard and low beyond keeper Jones into the bottom corner for 2-2.
Chesham broke out and Cameron scorned the chance of hat-trick, shooting feebly at Croft.
Four minutes after levelling, WGC were ahead, from a right-wing corner. Brettell's kick was headed on at the near post and Boodhoo arrived right on cue to meet it with a firm header past Jones for a 3-2 lead.
There was only one winner from this point and WGC might have had more, a Norris on-target effort was deflected into keeper Jones' arms, while Juan Cifuentes put Brettell in along the by-line, but full-back Dudrenec cleared his effort off the line.
It wasn't a vintage WGC performance, but the side were buoyed when they heard that nearest rivals Bedford had lost and third placed Broxbourne had been held, both at home.
WGC: Croft, Perrin, Kenna, Boodhoo, Brettell, Cato (Gibbon 79), Cifuentes, Smith, Arnott (C)(Caswell 67), Arnott (M) (Lovell 87), Norris.