Ann and Alan Keen have defended their decision to vote with the Government on a crucial debate over Heathrow expansion.
Ann and Alan Keen, members for Brentford & Isleworth and Feltham & Heston respectively, both opposed a Tory-led motion calling on ministers to 're-think' plans for a third runway last Wednesday.
The Government won the vote but saw its majority slashed to 19, with 28 Labour backbenchers breaking ranks.
Although the decision would not have been binding, had all 50 rebels who previously opposed expansion - including the Keens - voted with the Tories it would have resulted in a highly embarrassing defeat for Gordon Brown.
The husband-and-wife duo claimed they had voted against the motion because it ignored the Government's decision to maintain runway alternation, guaranteeing residents half a day's peace.
They also accused them of taking the moral high ground when it came to the environment, despite London Mayor Boris Johnson publicly backing plans for a new airport in the Thames Estuary.
"This was a blatant attempt to convince people who care about the environment that the Tory party was against expansion of air transport by tabling a motion against the third runway but, under questioning, she was forced to admit this was not the case," said Mrs Keen.
Labour MPs Andrew Slaughter and Virendra Sharma have both quit minor Government positions over the issue, sparking calls for Ann Keen to resign from her role as junior health minister.
Conservative councillor Peter Thompson, leader of Hounslow Council, said: "Surely given Ann Keen's views have been totally ignored, as a health minister she should do the honourable thing and step down."
Nic Ferriday, aviation campaigner for West London Friends of the Earth, labelled the Keens 'contemptible' for voting with the Government.
"Ann Keen's performance was particularly irksome," he added. "Having come out publicly and strongly against Heathrow, she has now betrayed her constituents and the people of west London. As a health minster, her indifference to more air pollution, which already kills 1,000 Londoners a year, is reprehensible."