Chapter 4 - Formations, Vessels, Aircraft and Vehicles of the Armed Forces
                   
Table 4.5 Royal Navy and Royal Fleet Auxiliary ships and submarines that were operational or undergoing refit by class and base port, at 1 April 2011
Operational vessels are manned, in and around water, with readiness state under the command of CINCFLEET. Vessels undergoing refit are unmanned and in a dockyard in the custody of the DE&S organisation.
 
Royal Navy submarines   Base port Operational   Undergoing refit   Total    
Trident   Faslane 3   1   4    
Fleet   Devonport 4   2   6    
    Faslane 1   -   1    
 
Royal Navy ships   Base port Operational   Undergoing refit   Total    
Aircraft Carriers   Portsmouth -   -   -    
Landing Platform Dock   Devonport 1   1   2    
Landing Platform Helicopter   Devonport 1   1   2    
 
Destroyers
   Type 42   Portsmouth 4   -   4    
   Type 45   Portsmouth 2   -   2    
 
Frigates
   Type 23   Devonport 6   1   7    
    Portsmouth 4   2   6    
   Type 22   Devonport 2   -   2    
 
Offshore patrol
   River Class1   Portsmouth 4   -   4    
 
Mine countermeasures vessels
   Hunt class   Portsmouth 8   -   8    
   Sandown class   Faslane 7   -   7    
 
Patrol craft
   University Royal Navy Unit Navigational training Various 14   -   14    
   Gibraltar Squadron   Gibraltar 2   -   2    
   Op IMPERIOUS   Faslane 2   -   2    
 
Survey ships   Devonport 4   -   4    
Ice patrol ships2   Portsmouth -   1   1    
 
Royal Fleet Auxiliary Service     Operational   Undergoing refit   Total    
Fleet Tankers     4   1   5    
Fleet Replenishment ships     2   1 3 3    
Primary Casualty Receiving Ship4     1   -   1    
Landing Ship Dock     3   -   3    
Forward Repair ships     1   -   1    
Roll-on Roll-off vessels5     6   -   6  
 
Source: MOD Resources and Plans
 
1. Includes Falkland Islands protection vessel.
2. HMS Endurance is currently non-operational while options for her repair or replacement are considered.
3. RFA Fort Austin in extended readiness.
4. Also known as Aviation training ship, as vessel has both these roles.
5. Commercially owned vessels that are leased to the Ministry of Defence for training and operations as required.