One copy of the miniature Parthenon frieze was sold to William IV for £42 in 1821 but its location is not known. He failed to gain a copyright on this work and others profited by making copies. Very few original copies of these miniatures are known to exist. In 1827, Henning and his son created sculptures in the style of the Parthenon frieze for a screen erected at Hyde Park Gate in London. The following year, John Jr. confirmed that he would recreate a copy of the Parthenon frieze for London's Athenaeum Club. Although only just over half the length of the 524 feet long original this model was at the correct scale and was constructed from Bath stone in agreement with Decimus Burton, the club's architect. Henning also made half-scale models which he hoped to reproduce for more modest buildings. Henning found that they were very popular but the business was captured across Europe by others who had unauthorised copies of his work. Equally distressing to Henning was the low quality of some of the copies. Because of this Henning became a supporter of the emerging laws on copyright but also was unhappy that his success was going unrewarded. In 1845, Henning again invested his time based around the friezes. This time he intended to recreate the two friezes as engravings. Trial proofs were made but unfortunately his partner in the enterprise, Alfred Robert Freebairn (1794–1846), died before either of the works were completed. Henning died on 8 April 1851, two years after his wife. He was buried as a pauper in Finchley Churchyard. Legacy Henning's original slate models were obtained by the British Museum in 1938. The Athenaeum Club and the screen at Hyde Park are extant. Copies of Henning's work are still being discovered. Family Henning's eldest son John Henning (1801-1857) was also a sculptor. He won the Society of Art's Silver Isis Medal for a relief entitled "The Good Samaritan". In 1825 he was commissioned to repair the statue of Queen Anne in front of St Paul's Cathedral. In 1836 he created the figurative panels on the front of Manchester Art Gallery. Samuel Henning (c.1802-1832) aided his father in the restoration of the Elgin Marbles. He designed the tomb of Duncan Sinclair in Kensal Green Cemetery. He died of cholera during the epidemic of 1832. Another son Archibald Skirving Henning became an artist and he has