A Scottish doctor and a former marine commando are aiming to raise funds for a mental health charity and promote physical activity by running up 10 of Britain's highest peaks tomorrow.

Andrew Murray, an Edinburgh GP, was appointed the Scottish Government's Physical Activity Champion and has previously completed numerous ultramarathons.

With running coach and former marine Donnie Campbell, he will run up and down Ben Lawers before tackling another four summits in the Nevis Range, and driving on to ascend five more mountains in the Cairngorms within 24 hours.

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The Big 10 challenge will be filmed for BBC Scotland's The Adventure Show.

Campbell said: "We are looking to support the Scottish Association for Mental Health, whose Get Active campaign is doing loads to increase Scotland's mental health through physical activity".