Eight fire engines and around 60 firefighters dealt with a grass fire at Cranford Park in Hayes.
Grass the size of four football pitches was damaged by fire.
London Fire Brigade spokesperson said:
“Many grass fires are avoidable with the most common causes being carelessly discarded cigarettes and matches, unattended barbecues and glass bottles that have been left on dry grass. We’re also concerned that some grass fires are being started deliberately and are asking parents to talk to their children about the dangers of starting fires.”
The Brigade was called at 1830 and the fire was under control by 2055. Fire crews from Southall and surrounding fire stations were at the scene.