Leslie Howard's recordings are full of pieces that he has prepared from unpublished manuscripts. His published editions include many works of Liszt issued in the Liszt Society Journal every year from 1988 to the present.
He has also edited 8 volumes of Liszt for the Hardie Press in Edinburgh, including all of Liszt's chamber music. There is also piano and choral music of Liszt from Sarastro, and a series of piano volumes of Liszt from Peters, including a new Urtext edition of the Sonata.
He has also prepared the new 2-piano score of Rakhmaninov's 4th Concerto for Boosey & Hawkes, and Bellini's I puritani for the Collected Edition in Italy. For that Italian enterprise he has also edited the full scores of Paganini's 1st and 5th Violin Concertos, including the new orchestration of no. 5