See notes on Whittingham Fair here:
www.informatik.uni-hamburg.de/~zierke/eliza.carthy/songs/whittinghamfair.html

"Whittingham Fair"- Bruce and Stokes, 1882, pp. 79-80. Nine verses with tune. In Bronson, The Singing Tradition.... p. 9-10 (under 2. The Elfin Knight.

See discussion in Bronson, B. H., The Singing Tradition of Child's Popular Ballads. The Elfin Knight Child No. 2, p. 7.
"At about the end of the eighteenth century, a different form of the ballad becomes dominant, in which the interlaced refrain lines are "Parsley, sage, rosemary and thyme" (or a similar jingle) and "once she (he) was a true lover of mine." All variants of this group are in a triple rhythm (including 6/8). ...."

There is a variant "Strawberry Lane," coll. about 1914. Also in Bronson.

Vaughan Williams, JFSS, II, 1906, p. 212, Printed "An Acre of Land," version sung in Wiltshire, 1904. Six verses and tune in Bronson, pp. 11-12.
The version "The Lover's Tasks, coll. Sharp, 1906. Two variants in Bronson, The Singing Tradition..., p. 11.

Also "The Sea Side."