Taoiseach Micheál Martin is set to meet the British Prime Minister for their first bilateral since his election.
Leaders are gathering for the British Irish Council in Blackpool.
This is the first formal meeting between Micheál Martin and Rishi Sunak since his election, though the two chatted briefly at Cop27.
It's the first time since Gordon Brown in 2007 that a British Prime Minister has attended the British Irish Council.
The body was established after the Good Friday Agreement to build relations between Ireland, England, the devolved Governments of the UK and Guernsey, the Isle of Man and Jersey.
Brexit, the Northern Ireland Protocol and the cost of living are expected to be high on the agenda.
With the British Government kicking out the deadline for fresh elections in Northern Ireland there's cautious hope a deal can be done on the Protocol with the new administration in Downing Street.
Rishi Sunak's attendance is being seen as a potential thawing of relations between Dublin and London, which Micheál Martin has admitted have been frayed at best.