A Swansea pensioner has claimed the title of the oldest person to complete a solo ascent of Mount Snowdon, surpassing the previous record holder by a full two years. John Llewellyn, 87, reached the 3,560ft summit of the tallest peak in England and Wales, though his triumph was tempered by a dramatic rescue on the way back down. The veteran mountaineer, who has conquered Snowdon on more than 20 occasions, had planned the climb as his last charita…