His older brother, Sir John Blackmore, knight, was in the confidence of Oliver Cromwell, and became governor of St Helena after the Restoration.
On 1 December 1646 the London presbyterians published a defence of their system, Jus Divinum Regiminis Ecclesiastici; or the Divine Right of Church Government of which Blackmore wrote the part relating to ordination.
William Maxwell Hetherington (History of the Westminster Assembly p. 288) describes the book as 'the most complete and able defence of presbyterian church government that has yet appeared.'
In 1662 Blackmore seceded with the nonconformists, and retired to Essex, where he lived on his ample means and gathered a small congregation.
John Woodhouse's academy, Sheriff Hales, near Shifnal, Shropshire, settled at Worcester in 1688 as assistant to Thomas Badland (ejected in 1663 from Willenhall, Staffordshire, and died 1689), and remained there till his death on 2 August 1737.