By Hilary McGrady The next government should commit to making sure everyone has access to green space within a 15-minute walk of their home, says the National Trust’s Hilary McGrady People who live or work in a city like London experience many benefits, but it can feel stressful and hectic. That’s why urban green spaces, such as the capital’s eight Royal Parks including Hyde Park, Green Park, and Richmond Park, are so vital for the health and wellbeing of millions. The National Trust’s Victorian founder Octavia Hill believed in the ‘life-enhancing virtues of pure earth, clean air and blue sky’…