"Seventeen come Sunday", "My Bonny Boy" and "Folk Songs from Somerset" are the names which were given to the three movements of "The English Folk Song Suite," a composition for military band by Ralph Vaughan Williams. It is often heard in an orchestral arrangement by Gordon Jacob.
Each of the three movements uses the tunes of several songs - most of which, if not all, were collected in Somerset by Cecil Sharp - thus the most likely place to look for words proper to these tunes would be in his works - but beware his early 20th century tendency to censor the words for sexual content.
In "Seventeen come Sunday" I hear the eponymous tune and a version (or possibly two versions) of Dives and Lazarus - better known as the Lowlands of Holland or The Star of the County Down.
In "My Bonny Boy" is the tune of the song which starts "Now once I was courted by a bonny, bonny boy" and another called "The Cutty Wren" which is well known.
Folksongs from Somerset has four tunes: Blow away the Morning Dew, High Germany, Whistle daughter whistle and John Barleycorn.
I'm not prepared to post words unless search elsewhere fails to find them - and if you are in difficulty I'll provide further references first!
John Moulden