An independent forfeiture committee decides whether recipients should lose honours if they have brought the system into disrepute.
Their decision is then announced in the London Gazette. The statement on Stuart Hall losing his OBE will be published this afternoon.
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The memorial service will be attended by Prince Harry and Meghan Markle.
David Browning admits manslaughter by diminished responsibility but denies murder.
Four people have died and the suspect is still at large, police said.