HH, I was not advocating that economic theory. That I mentioned the F4 should have given a clue - British engines, British INAS - CoG problems, re-engineer the back end etc etc.
RP, the bit I was trying to focus on was
multi-capable maritime weapons system
as you need a good surface surveillance and comms fit but what else? A P3/P8 etc would be lugging a hugely expensive ASW kit around for much of the time. I know there is a potential use of sonics but I won't go there.