@PonderLand, if the doctors recomment it and NHS is willing to pay for it, I think that's a strong medical case.
My partner just got it done because he developed a condition where his foreskin wouldn't pull back, bled and he wasn't sure he'd be able to have sex without condoms (luckily that's our method of choice anyway, but in future if TTC then would be a problem). He wasn't in pain but the doctor said if he left it, there was significant chance it would affect the pipework and a 5% chance of cancer.
The op/healing went well and he is really glad he got it done! Hasn't affected sensitivity. It is generally a very safe and standard procedure - obviously all operations carry a risk but relatively it is an easy one. It's your decision to make though. Don't be put off by horror stories and there are horror stories for absolutely everything.