Ok I accept that my figure might have been low, it came from wikipedia so quite a lot a salt may be needed, if we take the figure of $251,000,000 quoted in the article you linked to = roughly £156,150,000 it just highlights the probelem of purchasing sufficient assets even more as for that you could buy 223 spitfires. I accept that it's all been done before and the figures for F35 are purely finger in the air jobbies but it's fun to speculate isn't it?