SO Amber Rudd is gone, the pressure on her was too much.

I wrote about the mounting pressure on her, and the effect it was having on the Prime Minister as a consequence, in my Fair Point last week. But I must admit when she announced her resignation on Sunday night, I was surprised.

Not because of why she went - but at the timing.

The Windrush scandal was always heading towards this political fallout. The anger intensified with every new story of one of 200 British citizens treated like an illegal immigrant.

Ultimately what did for Ms Rudd was telling MPs last week the Home Office did not have targets for removing illegal immigrants, when later it emerged she had set out her "ambitious but deliverable" aim to deport 10 per cent more illegal immigrants over the "next few years", in a letter to the PM. Ms Rudd may have described it as being inadvertent - but if you mislead MPs there are going to be serious consequences.

What surprised was when it got to Sunday afternoon and she was still in post, I just assumed she would attempt to stay on. It has been reported that the decision was entirely hers, with Number 10 officials and her friends in government trying to persuade her to stay just hours before the announcement.

I can only think their plan was to protect the PM, because the longer Ms Rudd stayed the focus was on her record, and not what happened when Theresa May was the Home Secretary, when Windrush issues first began to arise.

With Ms Rudd gone the focus did switch. In a poll, released on Monday, 31 per cent blamed the PM, while only four per cent blaming Ms Rudd. But what will worry the PM most was that in the same poll, two in three people said that agreed that her government is now "unstable".

• On a side not, I have long been forecasting Sajid Javid could be the next PM, if Theresa May does step down in the near future. The Bromsgrove MP's move to one of the great offices of state sees him move a step closer to the top job. At the very least, I don't see the new Home Secretary running on a joint ticket, like he did during the last leadership contest. There are no guarantees of course. For every Theresa May going from the Home Office to PM, there is a Jacqui Smith, where the role turned out to be peak of a career.