Two serving Metropolitan police officers and one retired officer have been arrested on suspicion of perverting the course of justice over evidence given at the inquest of Sean Rigg, who died at Brixton police station in August 2008, the Independent Police Complaints Commission said.
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Dominic Chappell, the man who bought BHS for £1 from Sir Philip Green, is to be prosecuted by The Pensions Regulator.
The 5,000 ecstasy pills had an estimated street value of £36,000.
Police say it is "too early" to know if the body is that of journalist Kim Wall, who is believed to have died on board an amateur submarine.