I'll do UK champs.

IBF LH - Clinton Woods
WBC/WBO/WBA SM- Joe Calzaghe
WBA LW - Gavin "The Rock" Rees
WBC LW - Junior "The Hitter" Witter
IBO & Ring LW - Ricky "Hitman" Hatton
WBO CRU - Enzo Maccarinelli
WBC/WBA & Ring CRU - David "Hayemaker" Haye

Some Other 'world' champs.

WBO Interim Sup Feath - Alex "Amazing" Arthur
WBU Feath - Derry "Golden Boy" Matthews
WBU Middle - Gary "The Rocket" Lockett
WBU Lightweight - Lee McAllister
WBU CRU - Mark Hobson

I doon't know if I've missed any one out