The BBC radio programme Sunday had a segment about this. Listen here (about 8 minutes).
The item lasts 7 minutes. It includes an interview with the Bishop of Winchester.
Most of the discussion centred around the content of the school curriculum. Speakers appeared to be confused between two separate documents:
The latter document did make a recommendation concerning the curriculum, but the government appears not yet to have accepted this recommendation, certainly not in terms of the wording of the regulations.
Opponents of the SORs appear to be using the latter document as an excuse to object to the former.