The television series that documents Prince William's time with the Search and Rescue operations coincides with the news that the service is to be taken away from the RAF and privatised - a move that the prince is believed to have opposed.
ITV News' Royal Editor Tim Ewart reports:
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Michael Fallon has received reassurances from his US counterpart that security ties with Britain will "endure" following a vote for Brexit.
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The showers will be slow-moving, heavy and thundery at times, particularly in central and eastern areas.