The Bulls Under-21s gained revenge for their loss in London earlier this season by edging past Harlequins 20-18.
Basil Richards' side battled back from a 14-10 interval deficit to overcome their oppponents at Odsal and pick up a fifth win.
Jason Crookes, Dave Halley, Richard Johnson and Nathan Armitage all touched down, with Johnson and Luke Helliwell each adding important goals.
Their Under-18s counterparts also tasted success against the Londoners.
They thrashed Harlequins 50-12, with Kieran Hyde helping himself to a hat-trick of tries.
Joe Ford bagged an 18-point personal haul courtesy of one try and seven conversions while Ben Naylor (2), Michael Lang, Ryan Smith, Duane Straugheir and Elliott Whitehead were the other scorers.
- Terry Newton is back for the Bulls' game in Perpignan after completing his three-match ban but, as expected, Tame Tupou isn't in the 20-man squad as the new signing does not arrive in England until Sunday.
Newton replaces Richie Hawkyard in the only change to the squad picked against Harlequins. Jamie Langley (hamstring) also flew out this morning but he remains doubtful for Saturday's tie.
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