Is the low success rate just because the women are obese or because they are both obese and infertile because they have PCOS and it's not being treated properly? Without going into the gritty details, a lot of doctors give advice to women with PCOS that make things worse because they don't understand the disorder, which involves ovaries and hormones.
That is a good point. The article doesn't discuss that possibility but if that is not the cause of the infertility, and I can't believe that the majority of women are obese because of PCOS, I still think the NHS decision is a wise one.