Great Britain. 2005 World Heritage Sites. Blenheim Palace, England and the Greater Blue Mountains Area, Australia. 47p. silver, black, magenta, new blue and greenish yellow. Horizontal pair. Error, ‘Imperforate and with incorrect value of 43p. instead of 47p. and colour of the Queen’s head is white instead of silver’. Superb unmounted mint condition (with normal for comparison (used)). EXCEPTIONALLY RARE.