Hi Alan,
Here is a list of the Braintree Nonconformist Registers held by the Essex Records Office.
Braintree Baptist: baptisms c. 1785-c.1837. D/NB 18/4/1.
Braintree Congregational: baptisms 1813-1837, 1866-1887, burials 1813-1837, Noncon.reel 2 D/NC 41 (A7163) and baptisms 1923-1924 D/NC 41 (A7163).
Primitive Methodist Circuit: baptisms 1866-1920 D/NM 5 (A8193).
Wesleyan Methodist Rayne Road: 1859-1949 D/NM 5 (A8193), marriages 1900-1987 D/NM 9.
Regards