Kawasaki XP1 (no not a motorbike), what price we build it under license in 5 years time? The politics (UN not national-well maybe) would be immense but you have to start somewhere. A snip at $114m each.
It seems to have several advantages over the P8 - not least of which is having four donks. Buy 10 off the shelf, but with the Rollers BR 710; (there are 120 knocking about in the sheds, already paid for) for an extra 2,000 lbs of thrust each, so better performance, especially on two.
Simultaneously, start R&D for the Mark 2, with more British kit, get another 10 into service, then refit the Mk 1s to Mk 2 standard. Three squadrons plus the OCU for less than the cost of 9 Nimrods.
What shall we call the beast? How about Triton? The son of Neptune, he had the ability to calm the waves.