Britain's newest nuclear submarine is facing a delay coming to the Clyde due to serious safety concerns, according to a report by the Government's nuclear watchdog.
HMS Ambush, the second of the Royal Navy's new fleet of reactor-driven Astute-class submarines, is nearing completion at Barrow shipyard in Cumbria.
But crucial safety tests on its reactor have been banned by the Office for Nuclear Regulation (ONR) until flaws in the yard's emergency procedures have been fixed.
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