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Firefighters were called to a blaze at Westerham Trade Centre this morning.
The fire broke out in the toilets of a unit at the business park near London Road around 7.40am.
It is believed to have been caused by an overheated extractor fan which melted and set light to the vanity unit below.
Crews from two engines used a hose reel jet and a dry powder extinguisher to put out the fire by just after 8am.