The 23-year-old Scot will be seen later this year playing model Jean Shrimpton in BBC Four film We'll Take Manhattan.
BBC: Doctor Who star Karen Gillan to make theatre debut
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The creator of the app, Joe Shrimpton, is a trekking aficionado, with 19 years of trekking the Himalayan region under his belt.
FORBES: The New Travel Technology: Niche Destination Apps
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Wanting to share his experience with novice and advanced trekkers, Shrimpton created the Trek Nepal app as a guide for those with the desire to the take on the challenge.
FORBES: The New Travel Technology: Niche Destination Apps