Northern Ireland and Eire Exam Centres Edit
Craigavon - Brownlow College - Kieran McKernan, Examinations Officer - tel 028 3834 2121, email@example.com. He needs to hear in January for summer entries. He won't help with listening/practical exams, except perhaps Art. They do Edexcel and CCEA (and maybe others but not CIE)
Newtownabbey: The Free Presbyterian School will accept home-educated children. It is a CCEA centre and is currently applying to be an Edexcel centre for IGCSEs.
Belfast - Conway Education Centre Although the website says that they don't help with listening/practical exams, in fact they do. Can provide for any exam board and any exam you want, so far we have only used Edexcel for IGCSE English Lang and Geography. Contact name for them is Brenda.
Dublin - The Tutorial Centre At the moment, as far as I know, you have to go to Dublin to do IGCSEs. Please update this if you know otherwise.
[Some of this information might be out-of-date. Please update if you have more recent information]