Leicestershire,
United Kingdom 
is it safe to water food crops with water collected in a water butt from my asbestos shed roof
9 Jan, 2011
Answers
Hope it is safe, we have been using it for donkeys years.
But for a long and sensible discussion see here.
http://www.bbc.co.uk/dna/mbgardening/NF2759007?thread=7883287
9 Jan, 2011
It's safe, Bulbaholic's written exactly what I was about to!
9 Jan, 2011
The asbestos sheet are ok but don't damage them
9 Jan, 2011
Previous question
« my rhododendron leaves have suffered in the winter. What should I do/
It will be perfectly safe, George. The danger with asbestos is when dry fibers are inhaled and lodge in the lungs. The surface of an asbestos roof is hard and has been sealed naturally by exposure to the elements over many years so there will be a negligable amount of asbestos in the water.
9 Jan, 2011