1929 - Union with the Established Church of Scotland occurs. Carluke St John's is, once more, part of the National Church of Scotland.
1932 - A replacement organ is installed. This instrument, which is still in place today, is considered to be one of the best in the county.
1935 - A branch of the Women's Guild is formed in St John's.
Home Communion is introduced for the elderly and sick.
A monthly magazine is started, paid for by subscription through an envelope collection.
1936 - Electric Lighting is installed in the church and halls, despite some objections.
1939 - Extensive renovations are undertaken, including: a new pulpit, replacement choir railings and the removal of the front pews to provide more space for the choir; outside, iron railings are removed and the area in front of the door is paved.
1940 - The time of the morning service is changed from 12 noon to 11.30am. 'Dress code' for elders is relaxed except for Communion and Ordination services.
1941 - The time of the evening service is changed from 6pm to 6.30pm.
1943 - St John's celebrates 100 years of existence.
