Widnes kept alive their hopes of avoiding the Million Pound Game with a hard-fought 38-16 win again London.
The Championship side never got close enough to trouble the Vikings who now head to Perpignan next week in a game that will decide who finishes third.
It was the Broncos who took the lead after 10 minutes as Mark Ioane crashed onto a short ball close to the line, Sammut adding the extras to make it 6-0.
From this point though the hosts dominated the game and after Chris Houston and Ryan Ince had tries chalked off by the video referee, they finally got the green light when Matt Whitley took Joe Mellor’s pass to go over.
The Vikings then turned on the style in the second quarter as Lloyd White darted over before Danny Craven’s try opened up breathing space.
White converted both four-pointers before adding a penalty goal after he was hit later by Matty Gee, who was sin-binned.
Then as the half-time hooter sounded they scored a miraculous try as Craven kicked forward with the ball going through the hands of every Widnes player, before Charly Runciman some how got the ball down.
The second half started as the first ended with Widnes scoring, Craven grabbing his second as young half-back Tom Gilmore supplied him with a superb short ball. White missing both conversions either side of the break but they now held a commanding 26-6 advantage.
In need of something to lift their spirits the Broncos playmaker Jarrod Sammut supplied it as he stepped through the defence for the visitors second try.
Their joy was short lived though as Mellor, making his 150th appearance for the club, scored a wonderful individual try to restore the 20-point lead going into the final quarter.
James Cunningham then became the second London player to be sent to the sin-bin for a high tackle by referee James Child but that didn’t stop them scoring the next try, Kieran Dixon crossing after they kept the ball alive on the last.
The game was slowly becoming dominated by penalties and Child sent Runciman to the sin-bin for a professional foul to briefly make it 12 men apiece.
London were denied a late try by the video referee, before Mellor scored another brilliant individual chip and chase try to put the icing on the cake – full-time score 38-16.