The Nimrods are all away doing ISTAR duties in pastures brown and I understand from previous threads that there are not the aircraft left to go "sub hunting" at the moment.
In the good old days, Kinloss looked after seas cold while St Mawgan looked after the SWAps. With the demise of St Mawgan, then a base more in the middle of the country covers all regions for Maritime Ops, SAR etc as well as combining ISTAR resourses at cost saving. Moving down from Kinloss is not such a silly idea (except for the loss of Jock Jobs for the SoS to sort out).