In her first major speech since leaving No10, she will today say too many colleagues took their “eye off the ball” after the Cold War.

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She is also calling for cuts to taxes and welfare spending, and a delay to net zero commitments.

Meanwhile, ex-Chancellor Kwasi Kwarteng has turned on his former boss Ms Truss, saying she was “not wired” to be PM.

Truss wants corporation tax to return to 19 per cent and says the UK should refuse to implement a pending tax on cross-border profits.

The former PM will reject suggestions that her tax cuts were unfunded, saying cutting the higher rate of income tax and the ‘tourist tax’ would have increased revenues over five years.

She will also claim that Rishi Sunak has spent £35 billion more than she would have done in Number 10.

Meanwhile, Labour last night called on the Prime Minister to block Ms Truss’ resignation honours list twelve months on from the mini-Budget.

It has been reported that 14 people will receive an honour including Peerages.