I realised that I had not answered your question about Mary Hopton-Smith who runs an ABA service provider in NI, I expect you already know about it, here is the link:
ABAinNI
I mentioned Mary on MN a while ago, just because I saw her organisation's prescence at the recent NAS Internatinal Conference. I don't know her really, I know who she is and have met her. She trained and worked for LEAP (London Early Autism Project) which was an offshoot of the Wisconsin Early Autism Project which is a replication site for the Lovaas research. LEAP closed recently and, although it got a lot of bad mouthing, we used them for our home prog and had an excellent experience (I know we were luckier than some though). Hope this info is of use.