Serial sex offender Michael McAuliffe, 50, threatened to shout out the names before being bundled back to his cell by prison guards.
Judge Peter Benson, sitting in Bradford Crown Court, West Yorks, had seconds earlier adjourned the case to give police six weeks to investigate the claims.
Judge Benson had earlier passed the defence and prosecution council a letter from McAuliffe’s solicitors before the case was heard and as the paedophile was being led into the dock from cells
His barrister James Bourne-Arton, after reading the letter, told the court: “He has a desire to provide relevant information into investigations into those which concern the 1970s in the Westminster area.
“He has details and information, and more, there are other instances of child abuse and a paedophile ring, which he is willing to provide information on.”
