The trio's efforts were part of a 12-try Warriors blitz, with George Williams, Sam Powell and Ben Flower adding their own scores as the visitors strengthened their grip at the top of Super League to three points.
As well as his hat-trick of tries, Richards added 16 points with the boot to end London's three-match winning streak at home, with Luke Dorn's solitary touchdown their only bright spot during a miserable afternoon.
The Warriors entered the contest on the back of a seven-game winning streak in Super League and had already beaten the men from the capital 48-18 at the DW Stadium back in February.
Wigan did not take long to get started this time around, Charnley crossing in the corner after Kieran Dixon spilled Michael McIlorum's towering kick within five minutes.
Moments later the visitors had their second try, Richards romping home after Iain Thornley had sliced through the London defence. It was all far too easy for the league leaders, Richards adding his second score after 12 minutes when he profited from an excellent Tomkins pass to glide over.
The Broncos were being out-thought, out-muscled and out-paced at every turn and it was little surprise when a fourth try arrived on the 15 minute-mark, Tomkins showing dazzling footwork to claim a loose Michael Witt kick and race home from inside his own half.
The game was resembling a training exercise for the Warriors, Richards next to cash in with his hat-trick score when another Tomkins pass eased him in at the corner. Tomkins followed with his second before the half-hour, putting the finishing touch to a searing break from Charnley.
Wigan were to have the final say of the half, Williams selling a dummy and racing home from half-way, and it remained one-way traffic after the interval, Ben Flower the next to touch down for the visitors when he rumbled over at the sticks after 50 minutes.
London finally gave their fans something to cheer five minutes later when they claimed a try of their own, Luke Dorn seizing Craig Gower's chip through to race over in the corner. But that proved brief respite as Tomkins claimed his own hat-trick shortly after, showing a clean pair of heels to elude the Broncos defence.
By now London were a shambles, Charnley touching down for Wigan's 10th try after Dorn fumbled near his own line and then completing a hat-trick of his own, leaping to claim a Williams kick and score with ease on 68 minutes. Powell was to have the final say for Wigan, romping over after Tomkins had once again opened up the Broncos defence, with Richards adding his eighth goal shortly afterwards.
- Sports & Recreation
- Super League
- Luke Dorn
- Ben Flower