You need to discuss the surgical options with your NHS specialist. Ensure he/she is aware of your mountaineering ambitions. The UIAA website has a specific advice paper, authored by two UK mountaineering eye surgeons with a section on this topic. See the paper on "Eyes on Expeditions" in the medical recommendations section of this website: http://www.theuiaa.org/medical_advice.html . It might be worth taking a copy of the recommendations to your specialist appointment.
In reply to Blunderbuss: Of course as Dr Hillebrandt says you need medical consultation. Laser as I understand it is basically a technique, not a cure. I have had corneal grafts on both my eyes (1987 & 1991) for kerataconus and more recently a cataract (done with laser, I presume). I consequently need very special contact lenses, without which I'm as blind as a bat and that can lead to excitement when they pop at awkward times or with dust problems when it's windy. But the condition and treatment in no way has stopped me climbing in the Alps or elsewhere and I have never received advice not to. On the contrary.