IT is only when you live with someone that you really get to know all of their faults and foibles, and it is only now that we’ve been living with our new Prime Minister for six months that we begin to understand that she is incredibly adept at performing U-turns and behaving as if they really don’t matter.

On Sunday, she refused to answer four televised questions about whether she knew of the Trident missile that secretly misfired just days before a crucial Commons vote; on Monday, Downing Street admitted that she had known, but hey-ho.

On Tuesday, one of her key Brexit ministers, David Davis, ruled out the need for a White Paper on the Government’s stance on leaving the EU; yesterday, she agreed there was a need for a one and everyone is expected to accept this change as if it is all part of a political game.

This shows why such a paper is required: Britain’s baseline position needs to be seen in black and white because otherwise, under this administration, something said one day could turn into something very different the next.

Having brushed off yesterday’s Prime Minister’s Questions, Mrs May is heading to Washington for her much heralded first meeting with President Donald Trump. But which Mrs May will turn up: the one who means what she says, or the one who U-turns on an almost daily basis.

Mrs May said yesterday: “I am not afraid to speak frankly to a President of the US. I am able to do that because we have that special relationship.”

That frank speaking has to remind him that building walls, in both literal and trade terms, risks breaking the world up in a way not seen since the 1930s. It has to remind him that climate change is real and an enormous threat. It has to say to him that we won’t be shoulder to shoulder with him if torture is one of his tactics, and that women are real people, too.