if I want to find how many women in the uk have gone through genuinely "out of the goodness of my heart" surrogacy I actually can't find the data.
That's frustrating and I hope a lot more research takes place. Legally every surrogacy in this country should be "out of the goodness of (her) heart" but no, this may not currently be so.
At the moment, from what I can see, research often seems to include international and commercial arrangements, and UK arrangements from a long time ago, mashed together with current practice and experience. I assume the best stats on altruistic arrangements would come from the organisations and their members, although I'm not sure how you'd find out the number of independent arrangements. Maybe a freedom of information request to clinics? Even the granting of Parental Orders might not just be the UK "goodness of their heart" ones as it could include overseas arrangements. I don't claim to have all this info either.
con people into believing that there are loads of women who just love being surrogates so much we need to make it easier for them
I don't think anyone has said there are "loads of women" coming forward as surrogates in the UK. Not all intended parents are offered help by any means, as it depends on friendship and free will. Naturally that's consistent with not "buying" a surrogate's help as a "service" or "job".
If it was all fine and dandy, why try to deny the fact that every mammal on the planet has a mother?
If a surrogate has a baby for a couple, why do you want them to call themselves the mother when they have no wish to?
Why pretend that having no contracts is the same thing as a selfless act?
They're not the "same thing", but can occur at the same time.