Hi Greg
Had a look at South Perrott and no luck,Did 1820-1826 baptisms manually and no James anything between those dates ,would you believe?
Here's the others
William and Sarah Mitchell (possibly nee Spearing)labourer SP-Mary 23.2.1817,Henry 22.7.1821-17.11.1892,Robert 3.8.1828-5.12.1830,Sarah Anne 26.9.1830,John 7.6.1833 and 10.101.1835,Robert 22.4.1838,William 13.8.1841-27.6.1851 and Henry 25.4.1847-30.6.1851
John and Jane Mitchel labourer SP-banns 24.7.1825 to Jane Saunders of Cheddington-Thomas 2.11.1828-18.12.1869
Thomas and Elizabeth -Edward 8.3.1829,Eliza 11.8.1833-3.12.1848,Mary Ann 24,4,1836-14.3.1847
Elizabeth spinster SP-Amelia 7.2.1836 and Emma 27.1.1839-1.3.1839
Mary spinster SP- Sarah 20.3.1842
That's all baptisms 1812-1851 on the index and all the marriages for a groom called Mitchell.
Burials
William1772-8.8.1837
John 1731-26.7.1820
Betty 1770-23.8.1859
John 1777-16.1.1833
Jane 25.6.1843
Elizabeth 1797-10.2.1839 (probably Thomas's wife)
Thomas 1800-4.1.1857
Mary Anne 1801-10.7.1867
Edwin 1827-21.4.1908 (it says Edwin but probably Edward bap 1829)
Jane 1829-30.5.1803
Eliza 1830-24.10.1901
Thomas infant 4.5.1852
It looks like there's one big family at South Perrot which as you know is a small parish.
To me James looks either the son of William and Sarah in the gap 1821-1828 or Thomas and Elizabeth before 1829.
They are brothers so it would be the same family.
Ciderdrinker