Damon Evans, who posted the footage on X, tagged McDonald's and asked: "Do you think it is acceptable for your staff to soak the sleeping bags of homeless people in the middle of winter (or any other time of the year)? Disgusting behaviour. He wasn't even outside your premises."
McDonald's UK replied to the footage, and said: "Thank you for bringing this to our attention. It is not one of our employees but a third-party security guard."
They have also requested more information about the incident so it can be raised urgently with the security guard's employer, the company added.