The RN is committed to the following areas:
APT(N)-Caribbean/N.Atlantic(warship prescence recently cut back)
APT(S)-Falklands/S. Atlantic
STANAVFORMED- NATO Squadron in the Mediterranean Sea
Persian Gulf/IO(reduced from two ship prescence to one)
Far East (slated for fewer/smaller deployments than in the past( will also place a bit more emphasis on the IO. Or so I understand from talks with unofficial sources.)
FRE Unit- Ship completely prepared for Rapid/Emergency/short notice response to contingencies and taskings.
STANAVFORLANT- RN has withdrawn from this NATO Squadron in the Atlantic
These six responsibilities require approximately 18(Down from 24) ships to cover with nominally one on deployment, one in refit and one training up.
That leaves seven(six if one T-23 Frigate is placed in ROS) ships for all other duties including Home Waters Patrol, Allied Exercises, Carrier and Amphibious Task Groups. Not to mention retaining a semblance of a " war surge" capability.
With the upcoming decommissioning of the carrier HMS Invincible some stress will also be reduced though most of the time only one carrier has been fully operational even with three in-commission.
Notice that the 13(2 AE, 2 AOR, 2(new) AO, 4(older)AO and 3 AO(small) ship logistic vessel strength has yet to be cut and that is the key to continuous, sustained world-wide naval operations.
Note: The small AO Grey Rover is slated to go out of service in 2006. And the other two plus the 4 older AO's are scheduled for decommissioning in 2009-2010. These seven ships are slated to be replaced by the MARS program but it hasnt yet been officially defined yet much less fully designed and under construction.
From official RN site (Note: text in () is mine):
"Two new purpose-built Fast Fleet Tankers joined the flotilla in 2002 - RFA (AO's) Wave Knight, launched at Barrow in September 2000, and RFA Wave Ruler, launched at Govan in February 2001. These 31,500-tonne ships are diesel-electric powered, with three refueling rigs, and aviation facilities to operate Merlin helicopters. They are proving to be a great asset to the Royal Navy Fleet.
The four fleet support tankers, RFAs (AO"s) Bayleaf, Brambleleaf, Oakleaf, and Orangeleaf were all built as commercial tankers, but underwent conversion to bring them to RFA standards and equip them for naval support when they entered RFA service. One of this class is normally based permanently in the Gulf to support the Royal Navy’s Armilla Patrol ships.
The three small fleet tankers, RFAs (AO's) Black Rover, Gold Rover, and Grey Rover complete the tanker fleet. These ships, too, are normally deployed away for long periods, one to support the Falkland Islands Guard ship and another with West Indies Guard ship.
(Note: Black Rover is currently deploying to the Far East with HMS York.)
RFAs (AOR's) Fort Victoria and Fort George are combined fleet support tanker and stores ships, designed to give “one-stop†support to naval task groups. Large ships of 31,500 tonnes displacement, they are able to supply both fuel and stores to ships at sea.
The other two Fort class ships, RFAs (AE's) Fort Austin and Fort Rosalie, are fleet support stores ships to replenish warships with stores such as food, spare parts and ammunition. "
Hope this is accurate and helpful.