Climb at HarroWall Climbing Centre, in Harrow, Northwest London. It boasts the largest bouldering facility in London, and is one of five BMC National Performance Centres in the UK. There are auto belay and bouldering options available for climbers of all levels to try out. The wall is easily accessible by car and public transport via Harrow on the Hill Station. It is fully accessible and step-free, and on-site facilities include a gear rental, kit shop and cafe.