The design incorporated a munificent Britannia at the centre top with a shield and a reclining lion surrounded on either side by a representation of the continents of Asia and North America with people reading their mail in the two lower corners, bestowing the benefits of mail services to the countries of the world under British control.
[1] The Mulready illustration, engraved by John Thompson, was printed such that it appeared on the face of the sheets when folded.
(All mechanical printing devices from the Gutenberg press on are primarily designed to process flat rectangular sheets.
The design was so elaborate and misunderstood that it generated widespread ridicule and lampooning, and in addition was perceived in some areas as a covert government attempt to control the supply of envelopes, and hence control the flow of information carried by the postal service (which had become a government monopoly under the reforms).
[3] Only six days after their introduction, on 12 May, Hill wrote in his journal: "I fear we shall have to substitute some other stamp for that design by Mulready ... the public have shown their disregard and even distaste for beauty.
The withdrawal notice was sent gradually over a period of time so that the store keepers at Inland Revenue would not be overwhelmed with the volume of returned Mulreadys.