"And what about the forces children who have a parent deployed in afghan. Their deployed parent can't always choose when they will get R&R and that 2 weeks is a valuable time for the children to spend with a parent they have not seen for months before they go away again for more month".
There is a separate recommendation already for Forces children; if applied as intended, they should be unaffected by this. (I'm not ruling out the possibility of extreme incompetence by bringing in incompatible measures though! But I do think this one has been worked around satisfactorily.
And it's not to key to the overall position which is that children enrolled in school should be there for the entire time, unless ill or bereaved. I suppose those who are not happy with the state laying down how state education is provided will have to HE or turn to the private sector.
Or perhaps free schools and academies will be able to exercise more individual discretion? Or perhaps as they come directly under SofS, they will actually have rather less?