"He rang ahead to the guards in Naas to suggest they intercept it - but all the guard on the opther end wanted to know was he driving while phoning. He had no interest in the report of the speeding car. "
I have regularly ( perhaps two or three times a year for fifteen years or so) rang the guards about particularly dangerous drivers and have never once had this response.
I always first give my name and address. Then I confirm that I am willing to make a statement if they need it. Then I give the details of whatever driving nut I have observed. Finally, I say that I am not particularlybothered about a prosecution, but that I would like the nut to know he has been reported and that the guards might just pull him over and soften his cough a little. Then once I get a positive response from the guard, I say 'if you get any back chat I'll give you a statement, just ring me' and give my number.
I don't, incidentally, volunteer that I am a solicitor in practice, but if the conversation turns to where I am from and what I do, I would of course say it.