Former PM Boris Johnson has confirmed he will attend the COP27 climate conference in Egypt next week after being invited by the organisers.
His successor at No 10 Rishi Sunak has been under pressure to attend, after initially saying he was too busy preparing for the budget.
But it now looks increasingly likely that Mr Sunak will go after all.
His official spokesman said “significant progress” was being made on the financial statement.
No 10 said it would provide an update if Mr Sunak’s travel plans change.
The 27th meeting of the Conference Of the Parties (COP) is due to start in Sharm El-Sheikh on Sunday.
Mr Sunak’s predecessor Liz Truss had been set to go when she was PM and Scotland’s First Minister Nicola Sturgeon will also be at the event.
Mr Johnson said he had a “particular interest” in going to the United Nations conference, which aims to get international agreement on reducing carbon emissions.
He argued that the UK-hosted COP “was a fantastic global success” which was “doing a huge a mount of good for the planet”.
Mr Johnson said he wanted to use his appearance in Egypt to “talk a little bit about how I see things and how we see things in the UK”.