How many nations operate fighter / strike aircraft compared to those that have effective and capable submarines? The RAF tacking over strategic defence is pointless these days.
Furthermore submarines can remain 'in theatre' indefinitely if required and can turn up on your adversaries doorstep if need be... even if they're land locked. They require no friendly bases nor do they require the plethora of man power as mentioned above.
Are they trying to find jobs for the Nimrod / Typhoon per chance???