The style , however , is used when referring to the office and not to the person ; `` The Rt Hon The Lord Mayor of London '' would be correct , while `` The Rt Hon John Smith '' would be incorrect . The style , however , is used when referring to the office as opposed to the holder thereof ; thus , `` The Rt Hon The Lord Mayor of the City of London '' would be correct , while `` The Rt Hon John Smith '' would be incorrect .