The days of SAR being mostly maritime are long since gone, due largely to the decimation of the fishing industry; the quantity of overland tasking has also increased with better liaison with civ emergency services and dropping the "Downed aircrew is the primary role" mantra, allowing a wider range of tasking to be undertaken.
If that's the case then why don't we put a SAR flight at Shawbury....?
I think you'll find that the majority of SAR jobs could be considered Maritime.