betty,
At the end of it's life the MR2 fleet had an aircraft on 2hrs notice to fly, for either SAR or other possible scenarios I won't discuss here. The standby crew had long stopped staying overnight in respective messes, and were at home on pagers.
TODAY the UK has a C-130J on a similar standby 24/7 for a variety of tasks, once again I won't go into them on this forum, but one of them is SAR provision.
I'm sorry if this FACT doesn't fit with your personal agenda, but it is nevertheless a FACT.
I have already stated my reservations about the capability of this asset to conduct SAR, but it is available to be tasked, and denying it won't alter that FACT!