This is great version from Hampshire I have been singing for years.

POLLY VAUGHAN.
(from William Bone, Medstead, Alton & Mrs. Matthews, location unknown)

One MidsummerÕs evening the sun being gone down
Young Polly went a walking by the side of a pond.
She sat under a shady tree a shower for to stun
With her apron wrapped around her as white as a swan.

Young William he went a hunting with his dog & his gun
Young William he went a hunting as the evening came on.
Down among those green rushes as the evening came on
He shot his own true love in the room of a swan.

He throwÕed down his gun & away he did run
Crying Father dear father can you believe what IÕve down.
Down among those green rushes as the evening came on
I shot my own true love in the room of a swan.

Stay at home my dearest William till your trial comes on
That you may not be banished to foreign land
On the day of your trial your father will appear
With Fifty bright guineas and you will go clear.

On the day of his trial Young Polly did appear,
Crying people Oh people let William go clear.
With my apron wrapped around my head
As the evening came on,
He shot his own true love in the room of a swan.

Can be found in one of Frank Purslow's great books.

Tim Radford