As has been said, beating Khan would do it. That fight will be massive, as in a stadium event.
Win that and he goes from being known by boxing fans to a star.
Depends on his next couple fights.
If he fights Khan and beats him, i think his UK stock would be huge. He's in a division with star names, and if he can utilise his power a bit better into his fights with better competition, then who knows.
He doesn't have the style that other UK PPV names have had that attracted the British public.
Beating Khan could possibly bring the Floyds, Pacs, Thurmans (not a name), Bradleys, Garcias into the equation though.