I am 75 and use the pessary once daily but only use a smear of the Estriol cream on the vulva twice a day, a tube lasts me three months. I find that the pessary will do all of the work inside and the cream works great on the outside.
I am mostly symptom free but if the immune system is under threat flare ups will happen, I then use two pessaries a day and increase the cream to three times daily, usually after three days I am back to being symptom free again, this is how I have learned to manage the condition.
I haven't been confronted lately on my use of treatment approved by my surgery, but when and if I do I say you do realise that topical treatment is the equivalent of one systemic HRT tablet a year, what is all the fuss about.
I don't follow the NICE guidelines but the recommendations of the BSSM regarding GSM, my GP agrees.