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 Ukip leader confirmed he had "no prior warning" of Douglas Carswell's resignation from the party as he hit out at the "staunch Tory".
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.
The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.