A new pay-at-pump petrol station has opened in the car park of Asda's Old Kent Road store.
The petrol station is open 24 hours a day, seven days a week.
38 car parking spaces have been removed from the car park to make way for the petrol station.
Prices on Wednesday – the opening day – were 114.7 pence per litre for unleaded petrol and 115.7 pence per litre for diesel.
"We want to help people save as much money as they can, whether it's on their shopping or on their petrol, so we're extremely pleased to see our new forecourt at Old Kent Road open for business with competition-busting savings for motorists, as Asda continues to drive prices down in the capital," said a company spokesman.