Here is some info on St.Mary's, Whittall Street from British History Online site:
7. The church of
ST. MARY, Birmingham, was built in 1774, (
fn. 53) under an Act of 1772, as a chapel of ease to St. Martin's. The site was given by Dorothy Weaman, Mary Weaman (to whose forename the dedication alluded) and the trustees of Lench's Trust. The cost of building was raised by subscription, and Mary Weaman gave £1,000 towards it. (
fn. 54) A perpetual curacy was established, in the patronage of Mary Weaman and, after her death, of trustees. (
fn. 55) A parish, formed out of St. Martin's, was assigned to St. Mary's in 1841. (
fn. 56) The benefice became a vicarage in 1868. (
fn. 57) The income of the incumbent was said to be worth £200 a year in 1781, (
fn. 58) and £360 in 1896. (
fn. 59) Under an Act of 1925 the church was closed pending demolition, and the benefice and parish were united to those of Bishop Ryder's church. (
fn. 60)
The first incumbent was John Riland, who was assisted by a curate, Edward Burn. In 1786 John Wesley attended at St. Mary's and heard 'an admirable sermon' from the curate, (
fn. 61) though it is not certain whether this meant Riland or Burn. (
fn. 62) Burn, who was incumbent of St. Mary's from 1790 until 1837, was certainly in sympathy with Wesley's views. (
fn. 63) Burn was succeeded by J. C. Barrett, a well-known evangelical preacher who drew large congregations to St. Mary's until his death in 1881. (
fn. 64) From the middle of the 19th century the vicar was assisted by a curate. (
fn. 65) St. Mary's was a small parish, about a quarter of a mile square, in the gun-making quarter of the town. (
fn. 66) When the church was built it stood in open ground on the north edge of the town, but was soon built around. A number of dwellings were removed when the General Hospital was rebuilt (1894–7) (
fn. 67) in Steelhouse Lane in St. Mary's parish. A mission hall in Whittall Street was licensed for public worship from 1888 to 1907, and the chapel of the General Hospital from 1921 (it was licensed in the parish of Bishop Ryder from 1925). (
fn. 68)
The church, in Whittall Street, was an octagonal brick building with a small tower and spire, in the Classical style, standing in a large churchyard. The octagonal form was considered ideal for preaching and the church could accommodate nearly 1,700 people. (
fn. 69) The design, by Joseph Pickford, (
fn. 70) was thought by Hutton to show 'too little steeple and too much roof'. (
fn. 71) The tower was of three stages, the first round, the second octagonal with Doric columns at each angle, and the third, from which rose a slender spire, octagonal with a clockface and pediment on each alternate side. (
fn. 72) The tower and spire were rebuilt in 1866 to a very similar design, with pilasters instead of columns and a balustrade on the second stage. (
fn. 73) The first registers of baptisms (1774–1812) and of burials (1779–1812) are kept at St. Martin's church. The register of marriages begins in 1842. The 18thcentury silver communion service is now at St. Mary's, Pype Hayes, except for the two flagons which are at the Birmingham Assay Office. (
fn. 74)