As this is a rumour and speculation network.....
We know that the MOD had a major say in the aircraft choice for the new MCA contract. By filling in the gap between Wattisham and Culdrose with small MCA types they ensure that the MOD aircraft will get called to any larger incidents. If S92s had gone into Lee and Portland it would have shown up the obsolescent Sea King with their lower speed and payload.
We know that the MOD are fighting a rearguard action to keep a foothold in SAR, so perhaps they have rubber d***ed the MCA to ensure that they get an increased share of the S Coast action running up to 2012!
Just because you are paranoid doesn't mean that they are not out to get you!