Newland House in Coleford in the Forest of Dean has sustained serious damage following a large fire last night.
It took 47 fire fighters working throughout the night to put out the fire out.
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Jeremy Corbyn's visit has been one of the big talking points of another busy day at Glastonbury.
The Labour leader said socialist politics would not be put "back in a box" as he appeared on stage at the festival.
Turning windier with a few showers