Since Charles' middle name is Lee, I'm leaning towards the James Borton marriage 1776 at Tachbrook
I'm afraid I'm lost as to where this fits in

There's certainly a hive of activity going on around Dunchurch -10/+10 years of Joseph's birth. Taken from the parish registers at Dunchurch:
- 1767 Sarah d. of James & Sarah Burton of Thurlaston Bapt. Bur.
- 1768 Richard Burton, publican of Thurlaston Bur.
- 1768 Susanna d. of Richard & Elizabeth Burton of Thurlaston Bapt.
- 1769 William s. of James & Sarah Burton of Thurlaston Bur.
- 1769 Judith d. of Richard & Elizabeth Burton of Thurlaston Bur.
- 1770 John s. of James & Sarah Burton of Thurlaston Bapt. & Bur.
- 1770 John Burton, farmer, of Thurlaston Bur.
- 1771 Judith d. of Richard & Elizabeth Burton of Thurlaston Bapt.
- 1771 Ann d. of Richard & Elizabeth Burton of Thurlaston Bur.
- 1772 William Burton of Thurlaston Bur.
- 1773 Sarah Burton of Thurlaston Bur.
- 1776 James Burton widower otp & Mary Gilbert of Newbold on Avon Mar.
- 1777 William s. of James & Mary Burton of Thurlaston Bapt. (Nov 30th)
- 1778 James Burton of Thurlaston Bur.
- 1779 Sarah Burton widow Bur.
- 1780 Elizabeth ille. d. of Elizabeth Burton of Thurlaston Bapt.
- 1781 Mary Burton of Thurlaston Bur.
- 1782 Mary d. William Burton of Thurlaston Bur.
- 1786 William s. of James & Mary Burton Bapt.
- 1786 Elizabeth d. of Richard & Lydia Burton Bapt.
Seems pretty conclusive that James first marriage to Sarah Smith lines up, with Sarah dying in 1773 and James dying in 1778. I wonder what happened to Mary Burton? Maybe she's the death in 1781? Anyway there's no will for Mary d. 1781.
What I don't get here with either record is Sarah dies, why the baptisms at Bishop's Tachbrook? Surely this only makes sense if James moves to Wolston, which is admittedly quite close to Dunchurch, marries Mary Lee and then they move back?
But then they'd be two James & Mary Burton's in Dunchurch (because of James OTP marries Mary Gilbert in Dunchurch records), which doesn't appear to be the case?
Either way Joseph Burton makes his way back to Dunchurch...
I am beginning to wonder if there's any burials for James/Mary Burton near Bishop's Tachbrook.
I think I'm more confused now than when I started.