Proms regular, Lester Hillman leads a walk exploring this 1: 20,000-year event of 14th August 1975. This highly localised storm centred over the Suburb and in the space of two hours atleast 6.7 inches (170mm) of rain and hailstones fell. Immerse yourself in the personalities, eye-witness testimony, the science and meteorology, the drama and impacts which eventually led to a massive and costly long-term reshaping of today's Heath landscape.

Meet at Golders Hill Park (near café), North End Way, NW3 7HE