The former prime minister was in Westminster on Wednesday at the launch of the Growth Commission - a new organisation set up by Ms Truss to bring together economists focused on the issue of low growth, echoing her priorities from her short-lived premiership.

She was overheard at the event comparing sluggish growth in the UK to a "boiling a frog situation", saying it hadn't "dramatically gone away" with her exit from Downing Street, but "got worse and worse".

And asked by reporters if her fiscal plans had been the right one, she replied: "It's a long game."

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In the Commission's first report, unveiled at today's launch, the group claimed the average British person was £10,000 worse off than people in the US.

The report also said "consistent growth levels" of 3% by 2040 were achievable in the UK, and would lead to £ 35,000 worth of higher spending per household.

One of the group's co-chairman, Shanker Singham, claimed opportunities for growth in the UK were "abundant and increasing".

He added: "Failure to act will see us miss out on the opportunities presented by huge technological advances that we have seen especially over the last 20 years."

But the Commission did not outline policy suggestions of how to reach this figure, instead saying it would provide further analysis around large scale fiscal events.

While the ex-PM attended today's event, she has no formal role in the organisation.

Ms Truss took over in Number 10 back in September, with a promise to take on the so-called "anti-growth coalition" both in parliament and Whitehall.

But following a number of un-costed tax cuts outlined in her mini-budget, the markets were sent into a spiral, damaging both the economy and her credentials.

She attempted to save her premiership by sacking her chancellor, Kwasi Kwarteng, and bringing in Jeremy Hunt to reverse the policies.

But Ms Truss lost the support of the Conservative Party and resigned after just 49 days in power.

Mr Hunt remained as chancellor in Rishi Sunak's cabinet and the pair have taken a different approach, focusing on cutting inflation rather than taxes.

However, despite promises to halve the figure before the year is out, the number has remained stubborn and the Bank of England has continued to increase interest rates as a result.

And figures released on Tuesday showed fixed mortgage rates were now higher than in the fall-out from the mini-budget.