This story describes allowing a Liquid bomb onto a US bound Flight on 8/6. Follow the link to read the whole story.
http://waynemadsenreport.com/ (about 10% of the way down)
British and American authorities permitted a man with a liquid bomb to board a U.S.-bound flight in Heathrow on Aug. 6 -- the pilot foiled secret UK-US attempt to hype an incident en route to or at Boston Logan.
The London terror plan was "known" last Sunday by British and American authorities, according to the Indian press. American Airlines flight 109 from London Heathrow to Boston boarded a family of five, however, after the plane left Heathrow authorities determined that the father appeared on a British suspect list drawn up after the 7/7 London transit attacks. At first, the pilot was instructed to fly all the way to Boston where U.S. authorities could claim credit for apprehending the suspect. However, the pilot, fearing for the safety of his passengers and crew, refused and quickly returned to Heathrow without informing the passengers. Once on the ground, it was discovered that the male had in his carry-on baggage the type of combination liquid explosive and electronic device now being hyped by the British and American media.
British sources report that the reason for the delay in informing the airlines and traveling public about the liquid bomb on the American flight was to maximize the beneficial political impact for Blair and George W. Bush, both plummeting in the polls from the situations in Iraq and Lebanon.