Lions ended the game on a high with another goal late on from Mattey – turning in from close range after the returning Liron Mannie squared.
Lions now face Broxbourne Boro in the last four as they aim to make it three straight finals in this competition.
LIONS: David Myers, Adam Myeroff, Adam Harvey, Levi Levenfiche, Jamie Jackson, Sam Hamerton, Adam Arnold, Jake Furman, Jack Mattey, Lee Goldberg, Christian Edwards. Subs: Liron Mannie, Joe Beare
SCORERS: Arnold, Mattey