Hi MABS
My bf had a vasectomy in a previous relationship -2 months later we got together!! we (or should I say "I"!!) have done a LOT of research on reversals.
It is true that the sooner you get it reversed (within 2-3 years ideally) the better the sucess rate. The main issue however is that it is no longer possible to have a reversal done on the NHS - certainly not in London anyway - so private care is our only option. The operation is £2150!!!! You could contact the Vasectomy Reversal Service - i don't have thier number with me, but can get it if you want.
Success rate of the reversal also depends on a lot of other factors (was there infection after the vasectomy, was the original surgeon compitent or a butcher (like my bf's surgeon) - depending on findings when they start the operation there are 2 procedures that can be performed. The first and most successful is performed if there are no post-vasectomy complications - success rate higher (about 80% reversal success, about 60% pregnancy success rate). Second procedure is longer (4 hours or so) and has lower success rate. They also recommend that you harvest sperm for freezing because further infections can cause a successful reversal to go wrong. Also statistics state that it is usual to wait 12 months before getting pregnant, and that optimum success is achieved afyer 2 years!!
I would recommend that your husband have a fertility test to make sure the vasectomy was succesful - if you are feeling broody and if it is proven that the vasectomy was not succesful it will save a lot of pain both financial and physical(for him!).
Told you I'd done a lot of research!
Really annoys me that the NHS are so free with vasectomies without any counselling - such a HUGE decision for something so difficult to reverse. They certainly counsel before doing the reversal!
Let me know any more as I am the only person I know in this position at this time.
Hope this helps!