Liz Truss has promised to deal with surging energy costs and to cut taxes, after she won the Tory leadership contest to become the next PM.
Her plan, set to be announced on Thursday, is likely to include a freeze on energy bills - though precisely how it would work is still unclear.
Ms Truss will be formally appointed by the Queen at Balmoral Castle later, after a final speech by Boris Johnson.
The 47-year-old, the UK's third woman PM, will then appoint her cabinet.
In her victory speech, Ms Truss promised a "bold" programme of tax cuts to grow the flagging economy and to prevent the UK tipping into recession.
She will officially take the reins of power on Tuesday, bringing Mr Johnson's turbulent premiership to an end less than three years after the Conservatives' resounding election victory in 2019.
Ms Truss's most pressing decision as premier will be how best to shield households and businesses from the soaring international price of energy.
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