Very briefly, I shall build on the comments of the noble Lord, Lord Pannick. We are often obsessed with a view of what is normal, as if in every classroom in the land all children come from a traditional, normal background. I know from the children whom I come across daily in schools that they know from their own experience that their friends come from single-parent families, whether through bereavement, divorce, separation, kinship carers, foster parents and, yes, children of civil partnerships. Some children know that they were born by IVF and have more than two parents. The father of one child I know married the woman who had first been his mother-in-law, and later she became his step-sister-in-law before becoming his wife. That is something to do with family values in the 21st century.
The point made by the noble Lord, Lord Pannick, about the value of a stable relationship is absolutely key—and that is what the research should be looking at. The research quoted from Cambridge already demonstrates that there is really strong evidence in that sort of same-sex relationship.