Phillip Blond is the founder of the think tank Res Publica in the UK, and appears in this video produced for the World Congress of Families in London:

He says: "The attempt to redefine marriage is profoundly important because what its actually saying is that a structure which has persisted, sanctioned by the religions, since the first inception, is to be erased in the name of a form of equality ... [but] it creates a society in which the differences can't be endorsed, respected and actually creates a situation where the interest of gay people and the interests of straight people are opposed, and that doesn't further any good for any of us."