Updated 26 March
There has been some correspondence recently in the Church Times about this, following a mention by Giles Fraser in his 10 February column of the legal opinion of the Chancellor of the Diocese of London, Nigel Seed. See this letter on 17 February from Gavin Foster, then this letter from Nigel Seed on 2 March, and a further letter from Gavin Foster on 16 March. Most of this is now subscriber-only again.
No doubt there will be more to come… What is described as a final letter from Nigel Seed is now here (scroll to bottom):
…Mr Foster has come up with something entirely different because he has not approached the matter with an open and independent mind. He has started from what he believes the Statement was intended to say and has then interpreted what he says he thinks the Statement means, even though that is not what the words actually say…
The chancellor’s legal opinion referred to is now available in full at Inclusive Church: see Church Services after Civil Partnerships – advice for clergy.
Mr Foster has also written at Fulcrum: Church Services after a Civil Partnership Registration: What is and is not permitted?