The fire happened in the Topshop store in Bromley High Street
Sprinklers drenched a clothes shop with water to put out flames in a changing room.
The system was activated at around 8.50pm when a fire started in a light fitting in Topshop, High Street, Bromley.
A crew from Bromley fire station attended the incident yesterday (May 7) and a spokesman said the sprinklers did their job and flooded the ground floor.
They left the scene by around 4am after waiting for the fire investigation unit and the shop's manager to arrive.
The staff are waiting for engineers to come and reset the sprinkler system before the store can be reopened.
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