Abz,
Belfast Flying Club will get you your PPL and I suppose you can do hours building there. But there doesn't seem to be any CPL/IR/ME tuition. the best they have is IMC (from my quick browse of the website).
Do you have any idea as to whether you wish to go Modular or Intergrated?
In terms of SponsOrship, Flybe have it in some form. All it means is they pay some part towards your training (i.e 20K) and you have to pay the rest circa 60K. You are then bonded to the airline for X amount of years with a reduction of salary.
I did a search on google and found no fATPL schools in NI. So the choice is yours - go across the border or come to the mainland!