Perhaps the question that we should be asking isn't if the F35 was cancelled - but rather have we at long last reached the Duncan Sandys point? Have we reached a point where the F35 (assuming it performs as the Americans claim it eventually will) cannot survive in a S400 dominated environment? If we have, then what? It might be useful against a few terrorists with manpads, but does it protect our home against attack?
Along that line of thinking have we just built two very large expensive targets for the latest supersonic anti-ship missiles? All that I see is that intercepting these two-speed missiles is questionable at this point. Anent that last point does anyone know if the two-speed missiles can vary the point at which they increase speed?