Spectator letters: On wind turbines, Churchill’s only exam success, and the red-trousered mayor of Bristol

I still remember the first time I saw Vang Vieng, in Laos. It was many years ago, before the Chinese began pouring money in (such is the scale of Chinese investment, Laos now has high-speed rail). I was driving one of the very few rentable 4x4s in the country, picked up in the sleepy capital