Widnes coach Denis Betts enjoyed a Super League double over London with a 38-12 victory which saw teenager Adam Lawton help himself to a hat-trick.
The Vikings' academy products grabbed five of the night's tries as Lawton's hat-trick was backed up by a double from young winger Jack Owens.
Betts saw his side go 16-0 up at the break but after a second-half fightback from the depleted Broncos, he was thrilled to see his players stand firm.
"We needed a win," Betts said. "That over anything else was really important.
"We wanted to keep their score down and get the job done ourselves. We delivered and to be honest we could have scored more.
"Adam Lawton has always had potential. He's a big lad with lots of skill but there a lot of work to do still. We have a good future with the likes of him, Jack Owens and Grant Gore coming through.
"There was a little bit of inconsistency there in our game but overall I'm pleased. We have to make sure we are tight in certain areas, we still have to improve.
"What you see is what you get with our lads. Sometimes we fall short but it's not through lack of trying."
The visitors were without Jamie Soward (fatigue), Michael Witt (calf), captain Tony Clubb (knee) and Michael Robertson (hip and knee) as Tony Rea, perhaps with one eye on the Challenge Cup semi-final with Wigan next week, brought on-loan Jacob Fairbank and new arrival Ryan Shaw into the fray.
"We spent the first half adjusting to late changes in our team," Rea said. "We spent the half getting to know each other. We chased the game and got caught out.
"The Challenge Cup game with Wigan is another day. We had our eye on this game with Widnes but it's this time of the year, teams have injuries.
"If it was a final some of them would have played but no one was rested tonight."