Professor Alex Linley plunged into Britain's coldest lake to raise money for the hospital that saved his daughter's life. On 29 January, the founder of the Centre of Applied Positive Psychology plunged into Llyn Llydaw, more than 3,500ft up Mount Snowdon, to raise money for The Children's Heart Appeal at Birmingham Children's Hospital (BCH). On the day, which marked the seventh anniversary of his daughter Sophie undergoing emergency heart surgery, the temperature was -3C and the lake was 90 per cent frozen. Linley used goal-setting, goal attainment, visualisation...