That, good sir, is Oliver Cromwell outside the Houses of Parliament in Westminster. It was created in 1897 by Hamo Thornycroft and erected in 1899. It has been the subject of many debates as what he stood for still divides many people today, with some calling for it to be melted down and others for it to be moved. Either way, it's a lovely work of art and I'm glad you got to see it in person.