Well, if we're to be strictly accurate "Mr Windsor" did not tour the chamber where the Parliament was sitting as both the Commons and Lords had decamped to Church House in Westminster a year earlier than the aforementioned incendiary bombing of the Palace of Westminster.
Thus King George VI may have entered St. Stephen's Hall and its environs within the Palace of Westminster (perhaps including the room known as the Chamber of the House of Commons) but he would not have entered the de facto "Commons Chamber".