Apparently it will have less firepower than originally planned, be easier to detect, and less capable of eluding enemy hunter-killer subs.

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The ongoing revamp is timed to coincide with the arrival in 2009 of the new Astute class of hunter killer submarines, currently being built at Barrow-in-Furness in Cumbria.

BBC: NEWS | UK | Scotland | Glasgow and West | Sailors move in to ?125m quarters