to avoid further problems, post boxes and Royal Mail vehicles in Scotland bore only the Crown of Scotland . A legal case, MacCormick v. Lord Advocate (1953 SC 396), was taken to contest the right of the Queen to title herself Elizabeth II within Scotland, arguing that to do so would be a breach of the Act of Union . The case, however, was lost on the grounds that the pursuers had not title to sue the Crown and the numbering of monarchs was part of the Royal Prerogative , and thus not governed by the Act of Union. It was suggested by Winston Churchill that future British monarchs should be numbered according to either their English or Scottish predecessors, whichever number is higher. [ 8 ] Less publicised controversies included the argument that the monarch was addressed as Your Grace in the pre-union Kingdom of Scotland (the monarchs of Renaissance England had been called both "Your Grace" and "Your Majesty" [ 9 ] ) and that the preferred title had been King/Queen of Scots rather than of Scotland . At the opening of the Scottish Parliament in 1999, Lord Steel , MSP , the Presiding Officer , referred to Elizabeth II as "not only the Queen of the United Kingdom but seated as you are among us in the historic and constitutionally correct manner as Queen of Scots." In 2002 Winnie Ewing , president of the Scottish National Party wrote to the Queen asking her to adopt the title