A London teacher, who underwent heart surgery 10 weeks ago, is set to run the London Marathon this Sunday to honour her daughter who died after being diagnosed with a heart syndrome. Sophie Martin, 31, aims to complete the race with her recently healed heart, hoping to demonstrate to her pupils that resilience can be found even in the face of profound grief. Mrs Martin described her heart feeling "broken in more ways than one" after losing Olive. Her daughter was diagnosed with hypoplastic left heart syndrome – where the left side of the organ is underdeveloped – during Mrs Martin’s 12-week scan. Born in autumn 2024, Olive was "really strong" but suffered a cardiac arrest and died two days later. This devastating loss left Mrs Martin, her husband, and their four-year-old son, Arthur, with "a lot of grief, sadness and shock”. She stressed the importance of discussing Olive for her own healing.…