I have seen suggestions that the dossier compilers had a connection to Summers and Swan and they did seem to be well informed;
Last August, a group of 10 “concerned citizens” wrote to the Commissioner of the Metropolitan Police, Sir Bernard Hogan-Howe, alerting him to “an appalling campaign of abuse directed at the parents and wider family of Madeleine McCann”.
None of the authors of the letter was related to or even knew Kate and Gerry McCann. It was, rather, they said, the behaviour of an army of online “[ censored word ]s” in recent months that decided them to turn to law enforcement. The abuses against the McCanns had “raged for over seven years now, but have lately become worse”.......
Yet the police yesterday ruled out taking any action. In a reply to the “concerned citizens”, Roger Bannister, the Assistant Chief Constable of the Leicestershire force – asked by Sir Bernard Hogan-Howe to look into the issues they had raised – wrote that, on the advice of the Director of Public Prosecutions, the evidence submitted of the abuse the McCanns had faced that had been “did not reach the evidential threshold for a successful prosecution”.
https://www.telegraph.co.uk/news/newstopics/madeleinemccann/11576515/No-one-has-the-right-to-take-away-a-parents-hope.html