Cabinet colleagues of Ruth Kelly are furious that the Catholic minister has been given special permission to miss a key vote on the Government's Embryology Bill.
Miss Kelly, one of several prominent Catholics in Gordon Brown's Cabinet, has told whips she will be in Brussels on 14 July, the day that the vote will take place.
The Transport Secretary has infuriated colleagues and some in Number 10 by refusing to vote for a key part of the Government's legislative programme because of her religious beliefs.
The Human Fertilisation and Embryology Bill contains several measures that Catholics feel uncomfortable about.
Uncomfortable is not the word! Try, in a state of apoplectic horror and trepidation.