>> Brexit isn't just on the mind of those in the UK. Since the troubles, tranquility has set in here. But for those on island side of Britain's land border, these are increasingly pensive times.>> It was curfew on the border. You couldn't cross the border between 8 o'clock in the evening and 8 o'clock in the morning.
>> This border village bloc line in the Republic of Ireland saw some violence in the troubles. But it's the potential return of customs and trade barriers that locals like Michael McLaughlin fear.>> Both sides benefit from it, and that all disappeared. So we're worried that that comes back again.
And if that comes back again, it's gonna be serious.>> Local councillor John Paul Feely shares those concerns.>> The Irish customs were there, when the customs left we secured that site and an enterprise center has been developed there again with European funding.>> Both sides of the border here benefit from EU funding.
Qualifying for recovering conflict zone cash and for economic deprivation.>> I'm Reuters reporter Jacob Greaves and this, the Irish Republic side of the border with Northern Ireland just over there. People here see it as in their interest largely for Britain to stay in the EU. And that sentiment echoed by the Irish government in Dublin.
>> They, and others, have actually been campaigning in this referendum to the some 300,000 Irish nationals resident in the UK. They form the largest non-British bloc eligible to vote in the EU referendum. And those votes are expected to go one way.>> I intend to vote to remain.
>> Colin, who lives and works in London, has already sent his postal vote.>> A lot of it's more to do with the uncertainty around it. I think if you spoke to a lot of Irish people, they're not, similar to myself, big fans of the EU. But I think the uncertainty as to what would happen past the Brexit or the lack of a plan.
>> On the face of it, the thousands like Colin may not keep leave campaigners awake at night. Tens of millions are set to have their say on June 23rd, but if polls are to be trusted, it's going to be a margin call.