You would need to go through a doctor, I believe. I was recently referred to a specialist clinic for my condition, which required funding, and this had to be approved by the.....possibly PCT, but I'm not a hundred percent sure.
Anyway, I think a doctor would need to put the case to the aforementioned committee, and then they provide the funding. Least that's how it was with me- my doctor had to provide a load of evidence and do paperwork and stuff to prove to them that I needed this referal.
My boyfriend is currently going through a similar thing to me and started by seeing his GP, who was then able to set the wheels in motion, so as to speak.
So...might be worth making an appointment with your GP to discuss this? Good luck.
(Hope some of that made sense!!)