His opera Sir John in Love contains his famous arrangement, Fantasia on Greensleeves, but, FTP, what English nationalist composer is equally well known for his Fantasia on a Theme by Thomas Tallis.
This composer's poetry-inspired song cycles include The House of Life, and On Wenlock Edge, which incorporate verses from the poems of Dante Gabriel Rossetti and A Shropshire Lad.  While organist at Lambeth, he collected the folk melodies that would become "Shepherds of the Delectable Mountains" and Tudor material that influenced his most famous work.  His opera Sir John in Love contains his famous arrangement, Fantasia on Greensleeves, but, FTP, what English nationalist composer is equally well known for his Fantasia on a Theme by Thomas Tallis.
This composer's poetry-inspired song cycles include The House of Life, and On Wenlock Edge, which incorporate verses from the poems of Dante Gabriel Rossetti and A Shropshire Lad.  
Ralph Vaughan-Williams