Birthday cards, telegrams, letters and thank you letters concerning Sir Clough Williams-Ellis' 90th birthday and the various celebrations; papers relating to the celebration at Portmeirion including a list of guests, the programme and invitation, photographs of the party and drafts of Sir Clough's speech, 1973; and pages from The Times, 28 May 1973. The correspondents include Henry, Marquis of Anglesey, Lord Morris of Borth-y-Gest, Robin Cooke, Jan Morris and Sir Donald Gibson.
Letters and telegrams relating to Sir Clough Williams-Ellis's knighthood, and his autobiography, Architect Errant, 1971-1972. Correspondents include the following: Emlyn Hooson MP, François Spoerry, Henry, Marquis of Anglesey, Sir Frederic J. Osborn, Sir Frederick Gibberd, Jan Morris, and Lewis Mumford.
Correspondence relating to Sir Clough Williams-Ellis's recovery after treatment in hospital due to a fall, with papers concerning Portmeirion, the republication of his books, and correspondence between his assistant and others concerning his death, the cancellation of visits and projects, and other subjects, 1977-1978. Correspondents include: Henry Anglesey, Jan Morris, Eirene White, Sir Hugh Wontner, Gerald Dix, Lewis Mumford, Sir Frederic J. Osborn and Lord Cohen of Birkenhead.
Letters mainly of a personal nature, including a letter concerning the Presentation Goblet to the Queen and Prince Phillip, 1972; a letter from the Royal Institute of British Architects, concerning Sir Clough Williams-Ellis's election as an honorary member; a letter from the University of Wales offering an honorary degree; and letters from the following: Sir Frederick Gibberd; Sir Frederick Osborn; Jonah Jones; James Morris; Earl Lloyd George of Dwyfor; Charles, Lord Aberconwy; Francois Spoerry; Christabel, Lady Aberconway; Augustus John; the Rt Hon. Richard Crossman, MP; Sir Dingle Foot; Henry, Marquis of Anglesey, and other politicians, artists and members of the gentry and the aristocracy, 1930-1976; together with thirteen letters from Lewis Mumford, 1957-1975, and a copy of an article by him, 1930, 'The Wavy Line Versus the Cube', and a photograph of Sir Clough Williams Ellis and Mumford.
Papers, newspaper cuttings and extracts of articles concerning various buildings and renovations by Sir Clough Williams-Ellis, including the house of George Romney, the School Museum at Giant's Causeway and Nantclwyd Hall. Also included are a poem to Portmeirion, copies of replies to Jan Morris, a brochure for the sale of Oare House and an 'Old Stortfordian Newsletter', 1922, 1929, 1961-1976.