Ten fire engines and around 70 firefighters tackled a grass fire in Rammey Marsh, Enfield.
Approximately four hectares of grass was alight, with crews making steady progress through the afternoon to extinguish the fire.
Firefighters were supported at the scene by a bulk water unit, which is being piloted this summer.
Bulk water units are able to carry 8000 litres of water to incidents, allowing firefighters to tackle fires more effectively in areas where traditional water supplies are absent or ineffective, as is sometimes the case with grass or wildfires.
London Fire Brigade is also trialling new wildfire response vehicles this summer, which have off-road capabilities and technology that allows firefighters to pump water while driving, enabling them to fight an outdoor fire more quickly and safely.
All firefighters have received enhanced training for grass fires and wildfires and a Wildfire Support Officer was also in attendance. They were deployed as a wildfire tactical advisor, providing key support to the Incident Commander. The welfare of operational crews working in hot weather conditions is a key priority and firefighters are provided with additional hydration packs, sun cream and protective headwear for personal protection on the incident ground.
Station Commander Scott Thorpe, who was at the scene, said: "Crews are working hard to tackle this fire.
"The blaze is producing a large amount of smoke in the surrounding area.
"Anyone leaving Junction 25 of the M25 and the A10 area surrounding Mollison Avenue is advised to please be aware of our crews' presence at the scene and drive cautiously in the area."
London Fire Brigade Assistant Commissioner for Prevention and Protection, Craig Carter, said: "We know many Londoners will want to enjoy the nice weather by visiting a park or open space. However, we’re asking people not to take disposable barbecues with them as they can cause grass fires, especially in hot weather when the ground is dry. These fires are unpredictable and can spread rapidly, causing a significant amount of damage.
"Don’t be tempted to barbecue on your balcony either. Balconies can contain combustible materials which can pose a risk to those barbecuing and others living nearby.
"If you are having a barbecue, never leave it unattended and be careful where it’s positioned. Aim for level ground and keep barbecues well away from anything flammable like sheds, fences, trees or tents."
As well as disposable barbecues, discarded smoking materials and leftover rubbish also pose a huge fire risk. People are asked to ensure their rubbish is placed securely inside a bin or to take it home with them. If you have had a cigarette, please make sure that it is completely out.
The Brigade was called at 1222 and the fire was under control by 1513. Crews from Enfield, Chingford, Tottenham and surrounding fire stations attended the scene. Crews were supported by firefighters from Essex County Fire and Rescue Service and Hertfordshire Fire and Rescue Service.