Voters in the North would like to see a referendum on a United Ireland sometime in the next five years, while voters in the UK believe Scotland is likely to become independent within the next decade, according to a series of polls.
The Sunday Times commissioned a series of surveys across the UK gauge attitudes towards the Union.
The findings highlight some of the difficulties facing Boris Johnson and the UK government as he struggles to keep the country together following its departure from the European Union.
In Northern Ireland, 47% still want to remain in the UK, with 42% in favour of a United Ireland and a significant proportion – 11% – undecided.
However, asked if they supported a referendum on a United Ireland within the next five years, 51% said yes compared to 44% who were against.
In Scotland, the poll found 49% backed independence compared to 44% against – a margin of 52% to 48% if the undecideds are excluded.
In Wales, where support for independence is traditionally weakest, 23% still backed leaving the UK while 31% supported a referendum.
Across all four nations, more voters expected Scotland to be out of the UK within 10 years than thought it would still remain.
In England, the margin was 49% to 19%, in Northern Ireland it was 60% to 28%, in Wales 49% to 23% and in Scotland itself 49% to 30%.
With crucial elections to the Scottish Parliament coming up in May, the poll found the SNP way ahead on 70% – up seven points since the last elections in 2016 – while the Tories were down six points on 25%, with Labour down five points on 19%.
– Panelbase polled 1,206 adults resident in Scotland between January 19-22. YouGov polled 1,416 English adults between January 19 and 20, and 1,059 people in Wales aged 16 and over between January 18 and 21. Lucidtalk polled 2,392 people in Northern Ireland aged 16 and over between January 15 and 18.