Not having seen the PM on the box, I can only go by the very disturbing article in the Sunday Times which hints at what the NSC were debating. If true, we are about to become the only major European navy that includes an amphibious capability, without a naval air arm (or indeed carrier capable aircraft), except the Dutch.
Sorry Not a Boffin but where did you get the idea that the Navy is going to be left with an amphibious capability.
Fox's leaked letter said:
Deletion of the amphibious shipping (landing docks, helicopter platforms and auxiliaries) will mean that a landed force will be significantly smaller and lighter and deployed without protective vehicles or organic fire. We could not carry out the Sierra Leone operation again.
So we can be pretty sure that is up for debate as well.