I have struggled in the past with getting my GPs to understand that there is a difference between systemic and topical oestrogen and that I need both. I will need a good case to persuade them to prescribe me something more expensive. They know about the burning I get, so if I say I have tried something that works, they may be more inclined to say OK
According to medicines.org.uk, each dose provides 0.5 mg of estriol, which, bizarrely, is the same as the 0.1% cream. As it's based on weight, I can only think that the ingredients in the 0.01% cream, which is more oil based, are heavier, so you end up getting the same amount of estriol.
I don't really seem to have an issue with the labial side of things, fortunately, I do think it is more in the bladder.