My question is, after the GR7/9s retire, why does the RAF need to replace this with a similar type of aircraft? Operations in Afghanistan are met by a number of high-end aircraft such as F15Es and Mirage 2000s that don't have the rough-field T/O and landing capability. It was suggested on this board that because of high-performance aircraft engines as well as a number of other reasons, CAS is better undertaken by helicopters than fast jets. The USAF's response to this is launching SDBs from their Eagles. Yet the RAF still sees it fit to eat up JFH's GR7/9s at detriment to the FAA's fulfilment of the Carrier Strike/Naval Strike Wing requirement.
Seeing as the RAF could meet CAS committments in Afghanistan by deploying GR4s with SDBs (or equivalent weapons), and that the Cold War-requirement for rough-field take-offs have not materialised, why does the RAF need the F35B? If they really wanted fast jets with good low-level performance they could even use Hawks... The MoD could then allocate all F35B buys to the FAA.
Conversely, if the MoD deem it absolutely essential to retain the capabilities of the Harrier and Lightning-B within the RAF, then they could do so but forfeit the GR4 replacement and allow the RN to build CVF in CTOL configuration, handing expeditionary strike primarily to the FAA (though they still would have Typhoons capable of launching Storm Shadow and Paveways).
