The south chapel is dedicated to St. Columba, a missionary from Ireland who brought Christianity to much of northern England. The chapel contains colourful wall paintings of contemporary events, including depictions of Saint Oswald and a knight slaying a dragon emblazoned with the pagan gods.
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Much rebuilding was carried out between 1866 and 1869, which was funded by the Earl of Feversham at a cost of £16,000, when Norman and later features were lost, including the font, which was replaced in 1868; the original medieval font is now in the church at Pockley. The church's nineteenth century restoration was in the Gothic Revival style but incorporates work from the old church.
In 1931 a Harrison and Harrison pipe organ was installed on a platform immediately west of the chancel.This organ replaced an existing instrument installed in 1868 by the Walker organ company.Mr Arthur Harrison retained some of the existing pipework and incorporated this in the new instrument.
The colourful north aisle murals were designed by the Rev. C.N. Gray and completed in 1909 by Mr Gast, a London artist. The murals depict the course of Christianity in the area and add beauty and historical interest to the church. The stained glass windows relate the story of the twelfth century lord of Helmsley, Walter Espec. The high altar and reredos were made for Moore by Robert Thompson, the celebrated 'Mouseman' of Kilburn.