Channel 4 News reported that a document carried on the London Underground by a civil servant was filmed by another passenger.
It discussed the "potential waiving of collective responsibility" ahead of a decision on airport capacity. The government has said it will make a decision on Heathrow "in due course".
The document photographed on the Underground was a printout of an email to Sue Gray, the director general of the Cabinet Office's propriety and ethics team.
It states that lawyers and members of the Cabinet Office's economic and domestic affairs secretariat "are seeking specific input from us on how to handle potential waiving of collective responsibility".
The document suggests that "one route for waiving collective responsibility would be a free..." with the next word hidden by the thumb of the woman holding it. The sentence continues "... allowing ministers to speak against the government's position in the House".
looks like a free vote to get them off the LHR hook..................