While on military service with the RAF Morrison first developed his climbing skills, during travels in the Middle East, including Kurdistan, Turkey and Iraq.

[17][18] He worked alongside CC colleagues Eric Byne, Pete Marks and Paul Nunn on the first Peak District climbing guides.

[5][19] Actively involved with the development of outdoor education in the Peak District, he was an Assessor for the Duke of Edinburgh's Award and an instructor for the Outward Bound programs at White Hall.

[28] While the team's reconnoitres of the Ogre found a feasible route, deteriorating monsoon weather and porter strikes meant they were unable to get above 17,500 ft. Before departing the area, they made the first ascent of a nearby peak, Mount Razaqi (18,320 ft.).

[33] After gaining permission to lead a second attempt on the Ogre, Morrison mounted an all-British team consisting of Pat Fearnehough, Ted Howard, Peter Jennings, Alan Burke and Dr John Minors.

[35] Establishing an alternative Base Camp at Ho Bluk, the team instead made two alpine style first ascents: ‘PaJo’ (19,000 ft.) by Fearnehough and Minors, and ‘PamShe’ (c. 21,000 ft.) by Morrison and Howard.

[37] While Morrison was deeply disappointed,[38] he accepted the alternative peak offered by the Pakistan government, and in May 1977, departed with his expedition members Pat Fearnehough, Pat Green, Paul Nunn and Tony Riley[8][37][5] for an attempt on the then unconquered Latok II (23,300 ft)[8][1][5][37] lying just to the east of the Ogre[39] The first expedition into the Karakoram that year,[38] the team established their Base Camp on 1 June near the Uzun Brakk glacier.

[41] While making a night-time return to Advance Base with Riley, after loading up with supplies and equipment, Morrison fell through a snow bridge into a deep crevasse on the Latok glacier.