Business of the House

Will the Leader of the House investigate an allegation that I received recently about the treatment of Public and Commercial Service Union members following an incident in Parliament square yesterday? The PCS members drove in an open-top coach along Whitehall and through Parliament square and parked in Horse Guards parade. Those who came off the bus were asked by the police to give their names and addresses because African drums and a megaphone had been used as they drove through Parliament square. Is that not a heavy-handed approach to demonstrations outside Parliament, as the bus was merely passing through? I am sorry that I have not put the allegations in writing, but I have been able to verify them only in the past 20 minutes.