Training in a few weeks
I note that you are from N. Ireland in which case do not plan on a couple of weeks to complete your training unless you already hold a student training visa (M1, F1, or J1).
Due to the summer, there are many more students applying for visas whether for holiday, business or study; due to this there is a 5 weeks waiting period in the UK to get an Interview which was only 2 weeks before. THe US Embassy in N. Ireland is definitely more speedy, but I suggest that you check before making any firm plans. EFT will be able to help you with this.
As for choice, the only places I would recommend are EFT or Comair for CPL training.