Usborne annotated Wodehouse's final, unfinished novel, which was published as "Sunset at Blandings" in 1977, noting that "if the going had remained good "Sunset at Blandings" might, under another title, have been ready for Christmas 1976". The text of an address given by Usborne at the opening of the P. G. Wodehouse Corner in the library of Dulwich College in October 1977 was published as "Dr Sir Pelham Wodehouse, Old Boy" in 1978. In 1983 Usborne was one of the contributors to "Three Talks and a Few Words at a Festive Occasion", which contains the texts of talks on Wodehouse given by Usborne, Malcolm Muggeridge and William Douglas-Home in April 1982.