Sir Keir Starmer has said it is the moment to reset relations between the UK and the Republic of Ireland, APA reports citing BBC.
On Saturday, he became the first British prime minister to visit the Republic of Ireland in five years.
Downing Street said the visit marked a "new era of co-operation and friendship" between Britain and Ireland.
The prime minister held talks with Taoiseach (Irish Prime Minister) Simon Harris who was elected in April, just three months before his British counterpart - both are new to their roles.