Callum Simpson and Troy Williamson hit the scales in Leeds

Use 'watch live' icon above to follow stream

Super-middleweights fight for British, European and Commonwealth super-middleweight titles on Saturday

Simpson (18-0) aiming to stay undefeated as Williamson (21-4-1) seeks big win as underdog

Undercard begins at 17:50 GMT on BBC iPlayer before main card starts at 19:30 on BBC Three