Removing small trees and brushwood from a forest requires heavy machinery or large teams of workers with chainsaws and axes.

ECONOMIST: The fires return

"The controls we had put in place were inadequate due to the unusually high rainfall, which resulted in surface water flowing onto a track that was being used by heavy machinery to extract timber from the forest, " added Mr Garson.

BBC: Forestry Commission fined ?24,000 for Powys pollution