A total of 41 people seceded from the Back Street Baptist chapel in 1813 because they disapproved of the doctrines of the new minister. They rented premises on Wicker Hill and their first permanent pastor was John Warburton, a Lancashire weaver. He was a very popular preacher, wrote a Christian classic (The Mercies of a Covenant God) and was one of the 3 founders of the Gospel Standard Baptist Churches. In 1816 the congregation purchased a site in Union Street and erected a chapel with seating for 700. In 1825 a baptistry was added and in 1828, a vestry. In 1826 some members seceded to form the Little Bethel chapel. In 1828 a Sunday school was established in a schoolroom at the rear and Isaac Pitman, the inventor of Pitman's shorthand, taught there. Warburton remained the pastor for 42 years and had a regular congregation of up to 1,000. In 1863 proper schoolrooms were built and in 1879 a further 3 were erected behind them.