Avtur vs Avgas
Whilst doing my Advanced Flying Training in Vampires in 1964 at Linton an Anson arrived and was duly refuelled. As Ansons were fairly rare beasts by then we all piled out of the crewroom to watch it depart. It got to about 600' whereupon it disappeared in a cloud of white smoke shortly to re-appear coming back. Yes you've guessed it it had been refuelled with Avtur. An airman was court martialled I seem to recall over the incident. The Anson touched down going downwind on the active runway and was towed in.
ACW