We want two: escort numbers don;t add up
Here's some basic mathematics. If you wish to have an escort always available, you need three vessels (one on station, one being refitted/repaired and one in transit to and from a patrrol area). If you wish to guarantee one vessel's permanent availability - you actually need four.
While I agree the front line escorts can be reduced, the anti-drug, anti-piracy patrols are essential and let me put it this way, have you ever been to the Carribean? While it may sound exotic, it's actually pretty grim.
I also noted that he missed the best submarine-killers of all - another submarine.
I firmly beleive the UK needs two carriers, 6 type 45 anti-air destroyers (the aster 15/30 missile system has been successfully tested this week), 8-10 anti-submarine frigates, 8 hunter-killer submarines but around 24 corvettes so the Royal Navy can have global reach (built at a much lower cost to augment the other surface escorts). It is a role the old Leander class provided, although the corvettes would be 'general pupose'.
This would add up to a carrier strike force of one carrier, at least one to two type-45 destroyers, two frigates, one submarine and six corvettes. The balance of the fleet would be engaged for other deployments.
That is what is called a balanced fleet and is something the Royal Navy needs.