I cannot believe that no-one has thought of this before!
Let's spend hundreds of millions on getting a capability for a tiny fleet. Then let's assume that we can keep at least 2 of the new, expensively modified aircraft on station 24/7 (as I believe our colonial friends call it). This is a worthwhile spend against the threat of ballistic missile attack from - hang on, it'll come to me in a minute.
Ok you chaps who are being mortared and mined in hot places - back off! We've got to spend all the money on detering Korea cos let's face it - they could lob warheads into Westminster tomorrow.
Idiot!