Potkettle.com there Crabbington. ARCCK regularly task RAF assets into other unit's 'patches' despite them not being the best option. Why? Only the controllers know the answer but I did speak to one a few months back who was completely misinformed about the speed, range and capability of the MCA assets and he was on duty at the time....
When I informed him that on a still wind day a certain north western based S92 would be quickest to the Ben he was fairly surprised.