1st class gold Machin security stamp counter sheet 2011 with M11L code was printed from October 2010 and appeared in January 2011.
Many Post Office branches do not stock these as they have sufficient stock of 1st class special stamps; customers wanting definitives are offered booklets or stamps from business sheets.
SG U2958 (also used for other years).
Singles, Gutter pairs,
Cylinder block of 6
Date blocks of 8 - 22/11/10 & 24/08/11