Boris Johnson has tendered his resignation to the Queen - who will now appoint Liz Truss as prime minister.

Johnson and Truss have travelled separately to Balmoral Castle in Aberdeenshire to meet the monarch.

Earlier Johnson bid farewell in a speech outside No 10 Downing Street, calling himself "a booster rocket" that had "fulfilled its function".

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.

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.