I've never flown VFR in UK Bravo airspace (still UIR to the best of my knowledge, FL245-660?).
Yes I appreciate your mentioning of schedule 8, but what you can do with a licence and what you can do under VFR are completely separate, save where further restrictions are placed upon certain licence holders. As far as rule 25 etc goes, it is my understanding that no other conditions exist which permit the normal lawful operation of a VFR flight.