I was over at the home of ejection seats recently; the Martin Baker factory. My job was to advise on what survival kit should go into the seat pack for the RAF's new F35 jet. The kit will help keep a pilot alive after ejection on land or at sea, as their aircraft will be flying from the Royal Navy's new Queen Elizabeth class aircraft carriers. There will be different kit options if they're operating in Desert, Arctic, Jungle or Temperate regions too. That's a lot of gear to fit in a small box – it's all about prioritising.