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A growing number of European countries say planes in their airspace have experienced interference to their GPS - or Global Positioning Systems. Suspicions have fallen on Russia, which denies involvement. GPS relies on signals from multiple satellites and extremely precise atomic clocks, which help pinpoint our exact locations on Earth. It's a system that is used beyond the realms of aviation - impacting financial, electrical and communications systems. A team of British scientists - dubbed 'The Time Lords' - is working on a new type of atomic clock, which could eradicate the threat posed by jamming - and even change the way we measure time itself. The 91¸£ÀûÉç's science correspondent Pallab Ghosh has been investigating.