The Taoiseach says a British exit from the EU would be a 'serious concern' - after a new study found a 'Brexit' could force Ireland to pay up to 200 million euro more to Brussels every year.
The Open Europe think-tank says the impact would be felt more in Ireland than in the UK - and would see the return of a physical customs border with the North.
Public Expenditure Minister Brendan Howlin says Ireland is 'not neutral' on the subject of an 'in or out' referendum on EU membership - and the Government will be encouraging its London counterparts to stay in the Union.
Taoiseach Enda Kenny says a British retreat from Europe would be a major blow.
