In the 20th century the two groups of Methodists, Primitive and Wesleyan, in Cricklade co-operated in many ways and after the First World War held joint mid-week services with the Congregationalists. In 1936 a trial period of amalgamation was undertaken with the congregations meeting in each other's churches on alternate Sundays. This continued until the actual union of the two congregations on 20th June 1938, an event preceded by church sevices on Sunday 19th June. The new congregation, known as Cricklade Methodist Church, met at the Calcutt Street church of the Primitive Methodists while the 'Priory' church of the Wesleyans was used for a united Sunday School.
During the Second World War the 'Priory' church was lent to the local Civil Defence force and the Sunday School moved to Calcutt Street. After the war the 'Priory' church was taken over by Wiltshire County Council Education Department and the chapel was used as a schoolroom. The Calcutt Street premises were renovated and redecorated in 1938 and in 1949 were registered for marriage services on 13th May 1939.