Vasectomy Reversal
I had to get a reversal myself after suffering a year of severe Post Vasectomy Pain Syndrome following my vasectomy.
It is indeed £3000, and the NHS will refuse to pay for it into the bargain.
It fixed the most severe part of the problem but I still have some residual pain nearly 5 years on.
Here are some chronic pain rates at 1 year and 10 years in a British Journal of Urology paper.
http://onlinelibrary.wiley.com/doi/10.1111/j.1464-410X.2003.04663.x/full
13% + still had pain a decade after their vasectomy.