Biggus,
In terms of The Helpful Stackers comments on the SDSR, I believe the current government decided that the Nimrod MRA4 was non viable, but rather than saying it was a dead duck but we still need an MPA, came up with the line that "we don't need MPA" to help justify getting rid of the white elephant that the MRA4 had become. However, as I said, those are just my personal thoughts on the matter.
and I 100% agree with those thoughts.