The allegations are linked to Elm Guest House and the Grafton Close care home in Barnes, south-west London. The arrests were made as part of Operation Fernbridge, which was launched after concerns were raised by MP Tom Watson. He told the House of Commons last year that a file of evidence used to convict Peter Righton of importing child pornography in 1992 contained clear intelligence of a sex abuse gang. Mr Watson also alleged a member of the group had bragged about links with a senior aide to a former prime minister.