North Yorkshire Fire and Rescue Service was alerted to the site in Plumpton Park in Harrogate at 7.38am today (January 24).
A spokesperson for the fire service said: "The fire is believed to be in the ducting roof.
"Crews are likely to be at the scene for some time."
Six fire engines and an aerial ladder platform were at the scene.
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Nick Hancock in the Morning playing Can You Dig It by The Mock Turtles
