I suspect the droppping of Tate and Brady was a gradual thing. Our church acquired a new vicar, William Henry Jones, in 1851. He had attended the Surrey Chapel (Methodist/Congregational but used BCP) in his youth, and would have been well acquainted with Methodist hymnody. He was at Magdalen Hall, Oxford with Thomas Helmore between 1836 and 1840. In 1857 the local paper reported on a 'fully choral service [where]the psalms were chanted antiphonally to great effect'; the choir being arranged either side of the chancel. This would imply that the choir had been moved from the west Gallery at some time previously. Perhaps Tate and Brady was thrown out at the same time.