In reply to Forester3:
I believe arson can carry a Life Imprisonment term where it can be proven there was intent to endanger life, otherwise a term of between 1 and 20 years depending on the circumstances.
It's a very serious crime.
If arson is proven in any of the current fires, I hope they throw the book at the culprits.
I read in the Sunday Times that a gamekeeper witnessed a gang of 4 youths on off road motorbikes tearing up the moor to make an off road trials area, and when he approached them on his quad they taunted him and set fire to the moor. He has reported it to the police, including having identified the youths as "local" lads, but was complaining that the police hadn't taken any action against them, unless the arrest you refer to is one of them?