Sightseers tells the story of an ordinary caravanning couple from the Midlands, who travel across the country, before things take a turn...
It's written by Steve Oram and Alice Lowe, who both play the lead roles.
It's been five years in the making and is released in cinemas today.
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A large tent has been put up around the area while investigations continue.
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Two workers were forced into a back office as the robbers tried to force their way into a safe, police say.