Around six hectares of shrubland were ablaze near Sandy Drive at the height of the incident on Tuesday evening.
Specialist off-road vehicles, drones and wildfire equipment, like backpack blowers to push flames back, were used.
London Fire Brigade says it received 17 emergency calls with no injuries reported.
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By Carolin Ernst and Henrik Hille: Around 60 firefighters from Schüttorf were deployed for hours on Thursday. The fire alarm system at a textile company was triggered at approximately 4:30 p.m. Upon arrival, the firefighters observed smoke and heat – but the cause remained a mystery for some time. Even a thermal imaging camera initially provided no clues.
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