DJ Neil Fox has been arrested by the Metropolitan Police over an allegation that he sexually assaulted a woman in the early 1990s.
The arrest comes as the 53-year-old Magic presenter, known as Dr Fox, voluntarily attended a central London police station to answer bail.
In December last year he was questioned by officers over four separate sexual assault allegations.
Two of the allegations are said to have happened in the 1990s, while the third is said to have occurred in 2007.
He has been further bailed to return on a date in late March, pending further inquiries.