Well, as it stands today the RN has the following;
19 Frigates
3 Destroyers
4 Amphib Assault ships/Helicopter carriers
15 mine sweepers
7 Patrol ships
18 patrol boats
A few Ice patrol/survey ships
3 Regiments of Royal Marines
11 Nuke attack subs
4 Nuke bomber subs.
Again, that's the fleet today. With all due respect, I think they need a few more cuts to get to the size of the current RCN.
http://www.royalnavy.mod.uk/The-Fleet/Ships