Let me gently point out to my hon. Friend that what we are trying to do is provide access to marriage for a group of people who have not had that access to date. It is clear that there is an inequality affecting individuals who are in same-sex relationships and who have not had access to marriage.
We are not trying to create two tiers of marriage; we are trying to right a wrong of the past. It does not strike me as entirely logical to want to delay the Bill and give rise to more debate in the other place and more issues involving policy development in order to provide for something that straight couples would not necessarily want anyway. We do not have the evidence base that that would require, and the research that has been carried out so far suggests that we do not have a clear line of sight in terms of the end result.