We then walked past 10 Downing Street and thanked Gordon Brown for his letter! Up past Trafalgar square where Nelsons column is. http://www.solarnavigator.net/history/nelsons_column_trafalgar_square_london_england.htmWe also saw some of the Queen's guards http://www.army.mod.uk/ceremonialandheritage/household/queens_guard.htm