Historical child abuse: Key investigations

There are a number of ongoing investigations and inquiries - criminal and otherwise - into historical abuse allegations at institutions across the UK. Here is a guide to the key inquiries and their scope.

In the summer of 2014 a co-ordination hub was set up by the National Police Chiefs' Council (NPCC) to oversee the investigation of allegations of "non-recent" child sex abuse within institutions or by people of public prominence.

The team of officers working on this operation have been picked from forces across the UK, but the hub is based in South Yorkshire. The operation's staff are identifying links between investigations, and preventing duplication between forces

On 1 December 2015 the NPCC announced that the operation had received reports of 2,228 suspects being investigated by police forces in England, Wales, Scotland and Northern Ireland - 1,217 of the suspects were "related to institutions", while 302 were classified as people of public prominence.

The operation is being led by Norfolk Police Chief Constable Simon Bailey.

Umbrella inquiry: Operation Fairbank

Fairbank is the Met Police's umbrella inquiry into historical child sex abuse claims involving politicians and other public figures. It began in 2012 as a "scoping exercise" to establish evidence for formal investigation and went on to establish a number of criminal investigations: Operations Fernbridge, Midland, Cayacos and then later Athabasca.

Launched in February 2013 and led by the Met Police, Operation Fernbridge investigated allegations of abuse in the early 1980s at Grafton Close Children's Home in west London, and at Elm Guest House in Barnes, south-west London. In connection with Grafton Close, two people were charged with offences. One was found dead and one, Catholic priest Father Anthony McSweeney, was found guilty of sexually abusing a teenage boy. He was sentenced to three years' jail in March. The operation has been closed and investigations into Elm Guest House taken up by Operation Athabasca (see below).

This new investigation takes over from Fernbridge in investigating allegations about a paedophile network centred on Elm Guest House in Barnes, south-west London in the 1970s and early 1980s. Police are still appealing for information on 020 7161 0500.

Established in November 2014, Operation Midland is examining claims that boys were abused by a group of powerful men from politics, the military and law enforcement agencies at locations across southern England and in London in the 1970s and 1980s. It is also examining claims that three boys were murdered. Operation Midland has focused on the Dolphin Square estate in Pimlico, south-west London.

Operation Cayacos investigated allegations of a paedophile ring linked to convicted paedophile Peter Righton - a founding member of the Paedophile Information Exchange, which campaigned to make sex between adults and children legal. Righton died in 2007. Two men, Charles Napier and Richard Alston, were subsequently convicted and jailed for 13 years and 21 months respectively.

Greater Manchester Police is investigating allegations that Cyril Smith, the larger-than-life Rochdale MP who died in 2010, abused vulnerable young boys in the town. His family says he always denied the accusations.

The allegations first surfaced in 1979 when Private Eye magazine carried reports that he abused teenagers at Cambridge House, a privately run "hostel for working boys" in Rochdale.

It has also been alleged that he raped boys at Rochdale's Knowl View residential school and that he frequented Elm Guest House in south-west London - a location linked to the Met Police's Operation Fernbridge.