Answer:
A vasectomy reversal in not, unfortunately, available on the NHS. So therefore it is important that whilst price is important, that the surgeon's experience is considerable as the more a surgeon does a particular operation, the more skilled they become and the better the outcome.
So looking at cost v surgeon's experience you can expect to pay around £2500 to £3500. Overall, the most realistic outcome is a 90% or so success rate. However it is important to bear in mind that success is measured by the presence of sperm and not by pregnancy. Saying that many men do go on to father children after having a reversal of their vasectomy.