Well, I for one have been checked in a car crossing the border at Lifford on the way to the far north of Donegal.
I was also checked at a road block well inside the republic on a journey from the north west that had remained wholly inside the republic.
UK passport and drivers license examined in both cases.
Garda and Irish Customs are also checking cars and passengers on and off the boats - I have experienced this at Rosslare and Dun Laorghaire.
UK SB record passengers and car details of boat passengers arriving and departing at all ports including Stranraer and Larne.
For those who are PPL's and regularly fly the Irish Sea the form filling is becoming a bit of a nightmare.