He was Congregational minister at Ware, Hertfordshire (1831) and Leicester (1834), and in, 1841 founded The Nonconformist, a weekly newspaper in which he advocated the cause of disestablishment. Miall saw that if the programme of Nonconformity was to be carried through it must have more effective representation in Parliament. This was due largely to the efforts of the British Anti-State-Church Association, which Miall was instrumental in founding in 1844.
lieutenant was renamed in 1853 the Society for the Liberation of Religion from State Patronage and Control, known for short as the Liberation Society.
In 1874 he retired from public life, and received from his admirers a present of ten thousand guineas. He died at Sevenoaks.
16th United Kingdom Parliament. 20th United Kingdom Parliament]
One of the first fruits of his work was the entrance of John Bright into parliamentary life. And by 1852 forty Dissenters were members of the House of Commons.
He was at this time Member of Parliament for Bradford (1860–1874), having previously sat for Rochdale from 1852 to 1857.