Gainsey, we are RS 15 from 0800 to 2200 and then RS 45 from 2200 to 0800 which allows us to sleep (well, until the job phone goes that is). I believe the civvySAR crews do overnight from home but that would affect reaction times compared to sleeping on the flight so we don't do it - well not yet but it might be in the pipeline along with RS 75 at night but we will see.
You can run 24/7 SAR with 4 crews but not if you have to man the Falklands (especially on a flt by flt basis) and not if you have to comply with the EUWTD.
This is not one of Gordon's f***ups, this is all home-grown from the MoD.