London - The tit-for-tat revenge plot harks back to a 1996 MI6 spoof assassination scam, the former Libyan foreign minister told debriefers today.
This was to rub out Muammar Gaddafi and replace him with another of the Queen's nasty little bastards - such as the Yorkshire Ripper.
But abject operational failure and Peter Sutcliffe's notorious allergy to camels saw Gaddafi allowed to remain in Tripoli as Libyan Queen Regnant.
"If Gaddafi dies then so does his Mom," Moussa Koussa-from-Tuscaloosa warned MI6 interrogators.
"The Colonel's hit squad is already in the Palace and planning to put a semtex trapax in HM's knickers.
"She's been such a lararse disaster that only an April 1st RIP can atone for the evils of her firstborn spawn."
Security handlers dismissed Koussa's suggestion 'because if would also bring down the royal wedding' in four weeks' time.
"We'd be the laughing stock of the world if that happened," ex-MI6 stooge Sir John 'Captain' Scarlet warned today.
Lady Anton ia Fraser and Prince Philip are Camilla's birth parents.