I commend my right hon. Friend’s statement. I hope she agrees with me that Great Britain’s police force is the greatest in the world. For those of us who have served as police officers, I pay tribute to PC Keith Palmer who stood serving and protecting this House unarmed when duty called. He went towards the face of evil and made the ultimate sacrifice. Lone wolf terrorist attacks are notoriously difficult to defend. What, if anything, can be done to make sure this kind of event does not happen again?