He then explained more in a second tweet about what happened, adding: “I was leading in one of the horses & she bolted, knocking me over – rather forcefully!”
Stewart is not the only presenter to have come off air in recent weeks, with Guto Harri having already left the network.
GB News alleged he was responsible for an “unacceptable breach of standards” after taking the knee on air.
This was in support of England’s football players following a tirade of racist abuse after the Euros final.
On July 18, Harri formally quit his role and handed in his resignation.
GB News airs weekly on Sky, Freeview and Virgin Media.
