People who argue the case for an MPA based on "SAR" are delusional.
We desperately need an MPA for military reasons, but the the SAR idea is silly.
The same money the Nimrod would have cost if spent in the NHS would save vastly more lives, even if you lost a cruise liner every month.
There is a price on life, as every reasoning adult/NICE knows, and the price per life saved by long range SAR is staggering.
Argue on the basis of warfighting/defense of the realm, not silliness. It just makes it easier to dismiss all your arguments.
Incidentally, the argument also goes for rotary SAR. Just silly, really, but lots of fun.