Police had to use an angle grinder to enter the heavily fortified cafe in the town of Lancing.

Previous attempts to raid the cafe involved the use of a tractor to partially demolish a wall.

Mike Allday, 43, was arrested on suspicion of selling the Class C drug -- four others have been arrested on related charges.

Allday had previously worked as a security guard on the premises when it was known as the Quantum Leaf cannabis cafe.

"The raids have been a great success and we have arrested five people suspected of being involved in the supply of drugs in the local area," said Inspector Jason Wilson of Sussex Police.

"This crackdown is ongoing and we will continue to focus our efforts on those who think they can get away with committing drug-related crime."

"Our message to those offenders is simple – we will find out who you are and we will arrest you."

In spite of repeated attempts to shut down the cafe, previous attempts to raid the cafe have only yielded tiny amounts of cannabis.

But despite their lamentable record, the police were still bullish about their tactics.

"We will continue to do all we can to disrupt the trade of drugs," said Chief Inspector James Asser, district commander for Adur.