The World Association for the Development of Philately (WADP) and the Universal Postal Union (UPU) jointly conceived and developed the WADP Numbering System - WNS, which was launched on 1 January 2002.

GB123.12

Country / Post Great Britain
Date of Issue 27 July 2012
Primary theme Olympic Games (Summer Olympics)
Subject Welcome to the Olympics
Width 60.0 mm
Height 30.0 mm
Denomination 1st class
Number in set 4 (show set)
Layout/Format miniature sheet of 4 of 4 designs
Perforations 14.5 by 14.5
Stamp issuing authority Royal Mail of Great Britain
Printer Cartor Security Print, France