From the local newspaper -
http://www.thisisgloucestershire.co....l/article.html
I've spoken to the staff and it seems the youth who's been arrested is well known to both the police and the fire brigade as "someone who is more than fascinated with fires" (I'm quoting a police officer).
Damage is considerable,and it's going to be a while until it re-opens. A nice ending to the year !!