The prime minister is understood to want to attend the conference in Egypt and could go if his diary allows.

On Thursday No 10 said Mr Sunak was not expected to attend "due to other pressing domestic commitments including preparations for the autumn Budget".

However, the announcement prompted criticism, including from the UK's COP26 president, Tory MP Alok Sharma.

The annual UN climate summits are designed to help governments agree steps to limit global temperature rises.

Mr Sharma will hand over the presidency to Egypt at the COP27 summit in Sharm el-Sheik, which takes place from 6 to 18 November.

The conference finishes the day after Chancellor Jeremy Hunt is due to set out the UK's tax and spending plans in his highly anticipated autumn statement.

Environment Minister Mark Spencer said Mr Sunak had "a huge inbox", with challenges including the economy and rising global energy and food prices.

Mr Sunak has faced criticism from opposition parties, environmental groups and some Conservatives, after No 10 said he was not expected to attend the summit.