I have nothing on William Walkley and Elizabeth apart from the baptism of their daughter Margaret in Horsley, Gloucestershire 1737/8.
There is one other baptism in Horsley to a William Walkley and Elizabeth but that's in 1715.
A William Walkley also baptised three daughters 1725 - 1730 in Horsley with mother named as Rose, but there's no burial for Rose so I don't know if this is the same man.
Link to daughter Margaret,
http://www.genealogistsforum.co.uk/f...ad.php?t=18860