You can write to them. I had a similar problem a while ago with neighbours in Lucan. Any here is a copy of the letter I sent.
[FONT="]Pauline Gorman[/FONT]
[FONT="]PRTB, Canal House, [/FONT]
[FONT="]Canal Road, [/FONT]
[FONT="]Dublin[/FONT][FONT="] 6[/FONT]
[FONT="]09 November 2005[/FONT]
[FONT="]Dear Pauline,[/FONT]
[FONT="]We have neighbours a couple of doors up from us and are very noisy. Wheel spinning car tyres at 2 in the morning, parties until 6 in the morning. All this during week days. Not every week day. Say once every two weeks. Their landlord obviously won’t allow smoking in the house as they smoke out side at said parties and at said times. Their immediate neighbours have been in contact with the landlord (although, I haven’t his name or address) who promised to sort it out. Nothing has been done. The landlord has rented his house out to what appears to be the Russian mafia. Mysterious cars pull up at all times, “collect something”, and wheel spin away. I have contacted the Gardai about this but I’m a bit reticent calling the Gardai everytime there is a disturbance. I know they have much more important stuff to be doing. [/FONT]
[FONT="]The reason I write is because I noted in the press a few weeks ago that the deadline was 30th October for Landlords to register with yourselves. As my wife is a Landlord herself and already has registered, I wondered whether the Landlord of 16 Fforster Court, Lucan has also registered. I found details of all the properties in Dublin who’s Landlords had registered and guess what. I didn’t see 16 Fforster Court, Lucan there.[/FONT]
[FONT="]Yours truly,[/FONT]
[FONT="]A. Rat.[/FONT]