A man in his 60s and from Bedfordshire is being held by police investigating the Jimmy Savile child abuse scandal.
He was arrested at 7.45am on suspicion of sexual offences and is being questioned.
A police spokesman said the allegations made against him do not directly involve Savile and are classed under the strand of their investigation termed "others".
The Metropolitan Police Service is leading a national investigation into abuse allegations made against the disgraced television presenter.
So far, around 450 potential victims have come forward and 200 allegations of sexual assault have been made.
Officers are looking at three strands within their inquiry - claims against Savile, those against Savile and others, and those against others.
Most of the "others" allegations have been made against people associated with the entertainment industry.
So far Gary Glitter, comedian Freddie Starr and a 73-year-old man have been arrested and bailed in connection with the investigation.
Children's charity the NSPCC said it had received 236 calls about Savile, an average of five per day, since the first sexual abuse allegations emerged.
The number of contacts made about other claims of sexual abuse has trebled in the last month, rising to 550.
Director of the NSPCC's helpline Peter Watt said: "Sometimes people wait months or years before reporting abuse but we would urge them to act quickly so they can get help as soon as possible.
"While the whole Savile episode has been distressing it has also led to more victims of abuse seeking support, which is positive."