Jeremy Corbyn has promised to make St David's Day a national holiday if his party wins the next general election.
He is expected to make this pledge again at a union conference today.
Labour has said it will press ahead with plans to introduce new national holidays to mark the patron saints of England, Wales, Scotland and Ireland.
Labour will ask for the support of the governments of Wales, Scotland and Northern Ireland so that the same four holidays can be enjoyed across the United Kingdom.
Under the proposals, UK-wide public holidays will be held on
- St David's Day (March 1)
- St Patrick's Day (March 17)
- St George's Day (April 23)
- St Andrew's Day (November 30)
With eight public holidays, the UK has the fewest of any G20 or EU country, Mr Corbyn will tell the annual conference of the Communication Workers Union in Bournemouth later.