People aren't allowed to receive payment in this country in return for donation of organs either, so what point are you trying to make?
Elton and David's surrogate is in the US, so UK laws don't apply anyway. We also don't know whether or not the mother of the children has contact. She may well do.
I was asked why I disagree with paid surrogacy; I explained the analogy with organ donation and you said it was irrelevant.
I am fully aware that the Elton arrangement is made in California and is legal there. I am explaining my ethical view - which is, incidentally the legal view here and in most of Europe as well as other states in America.