Come together, Theresa May said. She did not add: "Right now, over me". But she may as well have.

It is often not the best sign in politics if you have to call for unity.

Perhaps the Prime Minister thought that saying it over and over again would help.

Overnight, Mrs May implored Britain to "come together".

She used the phrase again at Prime Minister's Questions (PMQs).

And she said it three times as she explained to MPs that she had officially filed divorce papers with the European Union.

What could go wrong? "Come together"? I mean it worked for the Beatles, right? Oh.

Some cabinet members did, rather noticeably, show a united front.

Andrea Leadsom, the high-profile Brexiteer who was Mrs May's main rival for the Tory leadership and is now the little-seen Environment Secretary, was forced to sit beside the Prime Minister as she set out her plans for exit talks with the EU.

Also on the frontbench was Boris Johnson, another key Leave campaigner, who was accused by one Labour MP of "smirking at the British public".

Opposition politicians, of course, told Mrs May that they were not united behind her.. Not at all.

SNP Westminster leader Angus Robertson told the Tory leader that, given the result of the EU referendum, whatever she might be the Prime Minister of it was "not a united kingdom".

She also faced some tough questions from her own backbenchers.

One former Tory minister told her to talk "sense not rhetoric and ideology". Ouch.

MPs who did not question the Prime Minister will nevertheless have given her cause for discomfort.

Grant Shapps, the former Tory party chairman who has pledged to try to amend Mrs May's upcoming Great Repeal Bill, spent PMQs standing chatting chummily with other Tory MPs and, at one point, an SNP politician.

Was there plotting afoot? How long will the Prime Minister have to wait before she sees peak Shapps?

Mrs May did manage to unite two Tory grandees, the pro-EU Sir John Major and the eurosceptic Norman Tebbit, by wishing them both a joint happy birthday.

After almost two hours minutes discussing Article 50 and Brexit Mrs May sat down.

Her overall message? Come together.

As some wags pointed out - if only there was some international organisation designed to do just that.