Mary heads to Edinburgh. Her late mother was Scottish, so the city holds a very special place in her heart.Edinburgh is full of excitement as it gears up for the marathon. It's the second-largest marathon in the UK, with over 35,000 participants, and Mary has been given the honour of starting it.Mary meets runners and their families before the race and offers support along the way before heading to the finish line, where she's be joined by her granddaughter Grace. Together, they share Mary's delicious homemade chocolate rocky road with the hungry runners after their epic race. It's an emotional and exhausting run for many, and Mary hopes her delicious treats will help put a spring back in their step.Later, she heads to the Royal Botanic Gardens to meet children from a local school as they work on the plots. She shares a recipe for pea pesto spaghetti inspired by the Gardens' produce.