A towering, living Tree Of Trees sculpture in front of Buckingham Palace in London acts like a beacon sending an “eternal message” that trees are the “superheroes” of our towns and cities, the designer has said. The 21-metre-tall Platinum Jubilee centrepiece features 350 British-grown trees representing more than 1 million trees that were to be planted across the country to mark Queen Elizabeth II’s 70th royal anniversary. Junior foresters visited the 96-year-old monarch’s London home to help complete the creation by planting a batch of 1.8-metre saplings in aluminium pots embossed with the mo…