Former Taoiseach Bertie Ahern says the border issue thrown up by Brexit is a “nightmare” for Ireland.

At the moment there’s nothing to stop people moving between Northern Ireland and the Republic – which will remain in the EU.

Mr Ahern says the overall impact of the UK’s vote to leave is “enormous” – especially for the one sector in particular.

“About 45% of our food industry goes to the UK, very valued markets that’s been the case for decades.

“They will take a big hit if there is tarrifs and that along with the currency problems, that makes it difficult.”