As part of Rowland Hill's postal reforms, letter sheets were issued in one penny and two penny values.
In the same way that the first postage stamps were issued in two values (Penny Black and Two Penny Blue) both the lettersheets and envelopes were issued in one penny and two penny values in the same black and blue colours as the same value postage stamps. Part of Rowland Hill's postal reforms were the introduction of prepaid lettersheets and envelopes designed by the artist William Mulready, whose name is always associated with these first lettersheets and envelopes. 
