A five-year-old boy is set to take on the UK’s highest mountain, completing an incredible treble and raising thousands of pounds after being inspired by his grandad’s brush with cancer. Jasper Dunsmore, from Dickleburgh, has already hiked to the top of Scafell Pike in England and Mount Snowdon in Wales with his dad, Peter. Later this month, the pair will attempt to scale Scotland’s Ben Nevis, completing the UK’s three highest peaks in the process. This latest hike will be different from the others as the Dickleburgh Primary School pupil will be doing it for a cause that hits close to home. “It…