And it is fitting that the club, 25 years old last week, should pip Wigan - the team they beat in their first ever game under the Fulham banner - to the final play-off spot.
The Broncos opened the scoring when Tyrone Smith squeezed into the corner after 10 minutes and they never looked back.
Skipper Mark McLinden scored their second four minutes later and fans� favourite prop Mark Tookey raced in from 30 metres before 18 minutes had elapsed.
Widnes, who are already relegated and down to their last 18 players, simply had no answer as Lee Hopkins broke to send Luke Dorn over after 23 minutes.
Dorn scored his 22nd try of the season seven minutes before half-time after exchanging passes with Feleti Mateo and he then set up Zebastian Luisi for their sixth try five minutes later.
Mateo then found time to get onto the scoresheet from close range before the half-time whistle to give the Broncos a 38-0 lead.
The Broncos continued to dominate possession after the break when Jon Wells, Dorn for his hat-trick and Karl Temata all crossed in the opening seven minutes.
Paul Alcock went into the corner for Widnes after 58 minutes just to prove the Broncos were not going to be allowed to have the game all their own way.
Dorn ran 35 metres on an intercept to resume normal service after 68 minutes and Luisi was over for his second two minutes later.
The Broncos then took their foot off the accelerator allowing Brad Watts to grab a consolation second try four minutes from time.
London: McLinden, Wells, Smith, Sykes, Bradley-Qalilawa, Mateo, Dorn, Stephenson, Highton, Tookey, Haumono, Hopkins, Ablett. Replacements: Purdham, Mbu, Lucky Luisi, Temata.
Widnes: Rowlands, Ballard, Connolly, Hughes, Viane, Watts, Kerr, O�Connor, Crook, Nash, Frame, Finnigan, J. O�Neill. Replacements: Emelio, Alcock, Johnson, Woods.
London: 68 (38) Tries: Smith, McLinden, Tookey, Dorn 4, Lucky Luisi 2, Mateo, Wells, Temata. Goals: Sykes 10.
Widnes: 10 (0) Tries: Alcock, Watts. Goals: J. O'Neill.
Referee: Phil Bentham (Castleford)