It needed to happen
Without starting to drift from the main point,i think there are a few factors not being taken into consideration Lee. Firstly the reason there is not enough SAS to cover operations is so many are leaving for the private sector,so much so that the military is considering to allow soldiers to take a years sabbatical in the hope they may return.Its true that the SAS takes its Lions share from PARA Regt (Some say this is reflected in the SAS's mind set being altered to a more'Hands on approach' than the 'Outside the box approach' it used to have).This has been to the PARA Regts benefit as they have been in a similar position to alot of Inf Regs, being undermanned in that they have been significantly reinforced (having at one time whole Ghrkha companies attached) but due to the SAS's importance (or the governments defence priority,Counter-Terrorism being No1) this has mean't no loss of a Bn to its structure,an enviable position. The Ranger capability which the British have woefully been lacking in for so long has been addressed by attaching a Para Bn to the grouping(Hopefully the proximty to the SAS and working with them will mean that more men will transfere from PARA to SAS via selection with greater sucess than presently) After all covert ops is their speciality and the assault on the Tora Bora caves(A complete Sqn conventional assault) was summed up by an SAS officer by the telling phrase"An ordinary Infantry Bn could've done it better". All in all the new force structure will enable a more intelligent,agile,proportionate and not to mention cost effective monetry & political response to a new type of asymetric warfare we now are fighting.