Four fire engines and around 25 firefighters attended a fire at a waste recycling centre on Newyears Green Lane in Harefield.
Around 100 tonnes of waste was alight. The fire was safely extinguished and there were no reports of any injuries.
The Brigade received the first of eight calls at 1746 and Control Officers mobilised crews from Ruislip, Hillingdon and Harrow fire stations to the scene. The fire was largely extinguished by 2007.