Even the most rigid and outdated practitioner will usually be willing to start HRT in someone under 60 OR less than 10 years from menopause.
You may have to be assertive but don't give up if you are fobbed off on the first attempt.
It may be helpful to arm yourself with as much knowledge as possible in advance, read the relevant NICE guidelines and ideally have decided what treatment you want to try and ask outright for that, for example estradiol patches and micronised progesterone, if that's what you want.
It is much harder to dismiss a patient who is well informed and states clearly what they want, rather than beating around the bush.
Also remember that even if you don't get your preferred treatment straight away, you do not have to accept any treatment that is inappropriate, for example antidepressants, you can just politely decline this.
Leave any unwanted prescription that has been printed off in the room so that they will have to cancel it.