Hi abbyH
May I ask, how do you know you won't see Nick at his clinic, were you told that? Are you going to Chelsea and Westminster? He does have a private clinic on Harley Street too, and a private appointment would give you a little more time which is much more reassuring, but you might also be able to then link his treatment recommendations back to his clinic at the Chelsea and Westminster which could save you cash in the long term.
Before you start searching and paying privately, do check whether you'll possibly see him and maybe even ring and say that the referral was to him specifically and request that you see him. He has a small team, all very knowledgeable specialists, and will send you off for all the necessary tests etc within the hospital. Just thinking that it might be confusing seeing different specialists and April is just round the corner.
Good luck to you! x