DJ Neil Fox has been arrested over an allegation he sexually assaulted a woman in the early 1990s.
The arrest came as the Magic presenter, also known as Dr Fox, voluntarily attended a central London police station to answer bail.
It is the third time Fox has been arrested by Metropolitan Police officers investigating claims of sexual assault.
In December, the 53-year-old radio broadcaster was questioned over four separate sex assault allegations.
Two of the allegations are said to have happened in the 1990s.
The third is said to have occurred in 2007.
Fox was first held on September 30 last year.
He has been further bailed to return on a date in late March, pending further inquiries.