Somehow you keep walking until you find yourself in deepest west London. Miles and miles have passed, and you’ve almost run out of podcasts to listen to. You didn’t know it was possible to walk this far. You see a familiar spot up ahead - the temperamentally-flooded beer garden of Twickenham’s White Swan. You wade through the flood zone to the bar, where you order a pint. It’s refreshing, and briefly your legs forget about the punishing miles you’ve just put them through.