If you read with brain AND eyes Don, I was saying that it is not only an out of the blue surprise, but actually a complete reversal of what was previously agreed.

Do you get it now?
Cameron plucked it form the air.
Not in conference, not in manifesto, not in Coalition Agreement, not in Queen's Speech.

When an alternative form of marriage, Civil Partnership for same-sex partners was agreed, it had been stated that marriage was NOT going to be changed, and everyone was happy.
Now suddenly it is.