I believe the Nimrod force costs in the region of 700million a year (including staff and materials).
So along with no more fuel being burnt, you've no radars breaking, no engines needing serviced, no more jets in deep maintainence regimes..
There's plenty of slots for aircrew elsewhere so I'm sure a bulk of them will be sent away soon enough, and theres little requirement for groundcrew, again i'm sure there will be an exodus on that front soon enough.
Part of all this was the delay of the MRA4, some 2 years later we are to expect it... So there are less flying hours on that as well...
Cant say exactly where each pound is being saved, but needless to say the (what I heard) 180 people who got redundency the other day are just a big group, lots of other people have got it and not been mentioned in the news.