Watch: The arms race in space and how the UK is defending itself

To play this video you need to enable JavaScript in your browser. The head of Britain's Royal Air Force has warned that we we now face an unprecedented threat in space, which could have a devastating effect on the satellites we rely on for communication, internet, bank transfers and satnav. A defence source has told BBC defence correspondent Jonathon Beale, that Britain has already used a ground based system to jam or block the satellite communications of a hostile state. Beale explains there is now a new arms race going on in space. Watch: The arms race in space and how the UK is defending itself.