There has never been a consensus on how to select members for an upper chamber. At least we now have a specific text, which could be amended, not just the ideas of individuals like Mr Bragg.

I imagine the Bishops have survived through a combination of institutional conservatism and a political calculation that excluding all of them will just add to the political problems of getting any bill through Parliament. Besides, the threat of losing representation in the House of Lords might discourage the Church of England from causing too much trouble over marriage equality.