Shadsworth Junior School, Arran Avenue, Blackburn, had its Children In Need fundraising complicated by a visit from the Ofsted inspectors.
Year 5 teacher Susan Danson, who organised the day, said: "There was a bit of panic at the beginning of the week, but its been fine."
The inspection took place with pupils in their own clothes and teachers in uniforms enjoying a day of events including an obstacle race.
The winning house team in the obstacle race got another own clothes day for free.
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