Great Britain. Historic Buildings. Issued 1 March 1978. The four designs were printed individually in sheets and together in miniature sheets. Several scarce major errors affected the printing of the miniature sheet, including missing light yellow-olive (Queen’s head), missing rose-red (from the flag on the 9p), missing new blue (from the flag on the 9p, lake on the 11p, and border of the miniature sheet), missing orange-yellow (shading from the 10½p and 13p castles). In addition, six miniature sheets are recorded imperforate.