It's recently become clear that Npower sold more ash
from Didcot in 2006 than they produced, and reduced
the size of their on-site stockpile from 315,000
tonnes in April 2006 to 164,000 tonnes in May 2007. So
the justification for filling Thrupp Lakes with ash is looking
very sketchy now.

See saveradleylakes.org.uk for the full story