Three men and a woman were detained after officers from the Met’s Specialist Crime team discovered 10kg of the class A drug.
One of the four men arrested was seen leaving an address in Bromley and meeting with an associate in a white van. Both men were detained and searched with officers discovering eight kilos of suspected cocaine.
A search of the Bromley address revealed a further two kilos.
Another man and a woman presented themselves at the Bromley address and were also arrested.
All four, aged between 26 and 42, were arrested for being concerned in the supply of cocaine and were taken into custody.
Detective Inspector Nikki Owen, from the Met’s Specialist Crime South, said: “Removing approximately half a million pounds worth of Class A drugs in an afternoon is great work by Met officers.
“Within a few hours we deployed, detained and arrested three men and one woman involved in the supply of drugs – which is the catalyst for violent crime that so many of us are concerned about. Drugs can devastate lives, ruin families and damage communities.”