You are more than a mile high and midway, snug in your window seat and sipping the trusty airline’s Chardonnay or piping hot Robusta. London is just an in-flight movie away. Suddenly the plane’s tannoy pings and a woozy voice rises above the jet-engine drone. “Hello, this is your co-pilot. Please fasten your seat belts and remain seated. We, uh, seem to be experiencing a little turbulence. Your captain...perhaps he had had a lil drop (hic), er, whiskey.”