Maybe I'm missing something? How do people know it's a taxi/hackney if he has no identifying marks on his car?
The NTA might be reluctant to get involved for two reasons. There were a few court cases in the West where they were accused of entrapment of the illegal drivers. I think at least one of them got off because of it. Also, is this happening in Drogheda? There's no reason (like horseracing or any other fun events) for the NTA enforcers to visit your town and get a bit of overtime and have a few pints.