This is Colin Brown - Colin, Julia and Harry were Ph.D. students together in Cambridge University, Department of Metallurgy and Materials Science.
He is commenting on the effect of ash on aircraft engines
This is an image of the damage caused to a turbine blade by volcanic ash
Colin says (paraphrased) "if this happens and engines shut down, the plane will crash and people will die"
The meteorological office in the UK issues reports of the spread of the ash using the best models
"It is not worth the risk"
