Michael Coombs, known as rapper Mike GLC, has pleaded guilty at Southwark Crown Court to supplying cocaine to an undercover reporter from the Sun on Sunday.
Former X Factor judge Tulisa Contostavlos, who is due to stand trial, denies being concerned in brokering the drug deal.
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Prince Charles joked about not being able to keep up with his grandchildren.
Ahead of his meeting with Jewish community groups, the Labour leader vows to ensure anti-Semitism is stamped out.
The retailer said there was no elevated risk of fire or explosion and there had been no reported incidents.