We had a vasectomy reversal done on the NHS just over 3years now (unsuccessful). So went straight to ICSI privately, as they wont give you NHS tx for a vasectomy or sterilization, as they see this as your choice not to have anymore children, which is understanable really.
I m sure I have seen it cheaper than £2000 for this, have a look around different clinics also the NHS charges may be cheaper.
I also found that I could not get a reversal of sterilisation (female) on the NHS and paid just under £2000- however, the op was unsuccesful as they had used cauterisation not clips- according to my consultant it was unlikely to be succesful and he did recommend IVF as a first choice- but I just wanted to be sure. Your message doesnt make it clear if male or female so this may be no use to you at all!!!! Wishing you lots of luck in whatever you chose to do,