The difference with BHRT (and the reason they are criticised) is that the prescription given is particular to you. So they can start you on a lower dose. The Newson clinic will put you on much better quality product than the standard GP stuff, but the minimum dose with Estrogel for example is 0.75ml....I am on 0.25 (BHRT) estradiol. I am also on the same for testosterone and 40mg for progesterone. That combo has not been through a specific clinical trial (despite evidence on the various doses individually) so it is talked about as 'not evidenced'.
I couldn't take the higher doses - there is research to suggest very low dose estrogen works so my doc has prescribed it. I have been to the Marion Gluck clinic and now I use the Online Menopause Centre. I am still required to have bloods, TV ultrasound, mammograms etc. and they are very cautious.
As good as the Newson Clinic is, if you don't do well with the standard protocols there is little flexibility, which I fully understand and accept.
If the main criticism is that I have too low a dose which won't work, well I am 'wasting' my own money and I have less chance of side effects/further cancer than those on higher doses.
I do everything under the supervision of an excellent and well regarded doctor.