Look on the Specialists link at the top of the page - it tells you where all the specialists are all over the country, both Private and NHS (and often they'll be the same people running both). You have a right under the Patients' Charter to be referred to an NHS Menopause Clinic and there are several in London, so go to your GP and insist. Of course, the waiting time will be longer and you'll get a shorter appointment - up to you.