No, it's a Bb. It looks wrong and it sounds wrong, but it's right.

Ralph Vaughan Williams (pron. Works


Operas
Hugh the Drover or Love in the Stocks (1910–20). 1952)
O How Amiable (1934) An arrangement of a hymn for chorus and organ originally written for the Abinger Pageant


Arrangements of Christian hymns
Vaughan Williams was the musical editor of the English Hymnal of 1906 and the co-editor with Martin Shaw of Songs of Praise of 1925 and the Oxford Book of Carols of 1928 all in collaboration with Percy Dearmer.

Ralph Vaughan Williams (pron. He was also a collector of English folk music and song: this activity both influenced his editorial approach to the English Hymnal beginning in 1904 in which he included many folk song arrangements set as hymn tunes and also influenced several of his own original compositions. : /ˌr[unsupported input]f ˌvɔːn ˈwɪljəmz/; 12 October 1872 – 26 August 1958) OM was an English composer of symphonies chamber music opera choral music and film scores.