LFFC,
I'd go one further and abolish the individual Service heads and make the CinC Fleet, LF and Air all 3* appointments and de facto head of Service. We may have the 4th largest budget to spend but as we use a huge chunk of the procurement slice acting as a "Benefits System" for British industry our projected size only requires two 4* posts - CDS and a newly advanced CJO (removing at a stroke the ridiculous notion that a 3* has to "ask" a series of 4* officers to commit FE@R to support ops). A commensurate cull of the "enrichment" 1*s and the winnowing of the 2* cadre will produce both savings and open up the prospect of keeping the promotion system alive during the next few years.