A horse in the King’s Guard has almost passed out in sweltering London temperatures, forcing the officer to pull an alarm as concerned tourists watched the incident unfold at Whitehall

The stoic serviceman appeared concerned for his trusty steed as his head continuously dropped and his tongue momentarily emerged from his mouth.

A horse in the King’s Guard has almost passed out in sweltering London temperatures, forcing the officer to pull an alarm as concerned tourists watched the incident unfold at…