Thinking about it, I think there is a use for the Trident boats, minus the Tridents
How about using them to offer 6 month mystery cruises. Just think "Where did you go on your cruise?" - "I could tell you but I'd have to kill you!"
These cruises could appeal to the super rich who are queuing up to be on Branson's commercial spacecraft. Come to think of it, we could turn the boats over to Virgin to operate - they may even make a profit.