Officers from The Kent and Essex Serious Crime Directorate are investigating the find.
The case is being headed by Detective Sergeant Tristan Kluibenschadl who said: "This is a significant seizure and we have been successful in taking a huge amount of drugs off the streets.
"If anyone has any information surrounding the supply and use of drugs, please contact the police, all information received is treated in the strictest confidence."
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The Prime Minister has praised the former soldier's "huge professionalism" in trying to save the life of Pc Keith Palmer.