The handling of a child sex abuse claim involving former Prime Minister Sir Edward Heath is to be investigated by watchdogs.
Wiltshire Police is to be probed after allegations made by a retired senior officer were referred to the Independent Police Complaints Commission (IPCC).
An IPCC spokesman said it is to investigate "allegations concerning Wiltshire Police's handling of an alleged claim of child sexual abuse made in the 1990s".
He added: "It is alleged that a criminal prosecution was not pursued, when a person threatened to expose that Sir Edward Heath may have been involved in offences concerning children.
"In addition to this allegation, the IPCC will examine whether Wiltshire Police subsequently took any steps to investigate these claims."