First Day Covers of 1991
Date of Issue - January 8, 1991
SG 1531 - 1535 - Dogs. Paintings by George Stubbs - (PP215)
Date of Issue - March 5, 1991
SG 1546 - 1549 - Scientific Achievements - (PP216)
Date of Issue - April 23, 1991
SG 1560 - 1563 - Europa: Europe in Space - (PP217)
Date of Issue - June 11, 1991
SG 1564 - 1567 - World Student Games, Sheffield and World Rugby Championship, London - (PP218)
Date of Issue - July 16, 1991
SG 1568 - 1572 - Ninth World Congress of Roses, Belfast - (PP219)
Date of Issue - August 20, 1991
SG 1573 - 1577 - 150th Anniversary of Dinosaurs' Identification by Owen - (PP220)
Date of Issue - September 17, 1991
SG 1578 - 1581 - Bicentenary of Ordnance Survey. Maps of Hamstreet, Kent - (PP221)
Date of Issue - November 12, 1991
SG 1582 - 1586 - Christmas 1991: Illuminated Manuscripts from the Bodleian Library, Oxford - (PP222)