File photo dated 29/04/84 of Muhammad Ali, former world heavyweight boxing champion, (left) and Henry Cooper (right), former world title contender, with DJ Stuart Hall (c) in London on the Stuart Hall's new Radio Two Summer Sounds Sports and Music show. Police investigating an allegation of rape and indecent assault have arrested veteran BBC commentator Stuart Hall. The 82-year-old former It's A Knockout presenter was detained this morning, sources said.