Nightmare for air passengers begins as hundreds of flights are cancelled and volcanic ash threatens half-term getaway

By DAVID DERBYSHIRE and RAY MASSEY On the ground: A car drives towards the erupting Grimsvotn volcano which has sent thousands of tonnes of volcanic ash into the skyBA, Easyjet, Loganair, KLM and Eastern Airways all cancel flights after Civil Aviation Authority warningPassengers stranded overnight at Edinburgh airport as chaos starts with 252 flights cancelledAsh cloud expected over Heathrow at