Hi Jeff,
LDS have two John Headleys christened in Enderby within a couple of years of each other:
9th Dec 1798, son of Marston Headley and Sarah
7th Feb 1802, son of Bryan Headley and Hannah Fletcher.
With the older John marrying Susannah Wells.
The only reference I can find to a Rachel is for a marriage to John Headley born "about 1808". So it could be to either of the Johns above.
I don't have access to detailed records, I'm sorry, but I hope this is a little help.
Best regards,
Alison