David Hutchinson from Derbyshire Fire & Rescue service says the blaze which partially destroyed the sports hall at the St Anselm's Prep school in Bakewell, most likely started in the bolier room, and the fire is not being treated as suspicious.
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Heavy, thundery downpours throughout the rest of the day, so take care on the roads.
There is also a Met Office yellow alert in place for heavy downpours.
Frankie Gavin was due to take on Sam Eggington at the Barclaycard Arena next week.