Around 10,000 tonnes of recycled cardboard bales are on fire at the Smurfit Kappa paper mill in Birmingham, West Midlands Fire Service has said.
The service said crews and agencies are continuing to battle high winds but are "working extremely hard" to bring the blaze under control.
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The Duke and Duchess of Cambridge met young people who have battled mental health issues on Saturday.
Former Chancellor Lord Geoffrey Howe was Margaret Thatcher's longest-serving Cabinet minister, also taking on the role of Foreign Secretary.
Lord Geoffrey Howe is known by many for his resignation speech which was seen as the catalyst which destroyed Margaret Thatcher.