Part of the old abbey chancel was at first used as the parish church, however this was later demolished in 1775 and the Earl of Eglinton built a new Abbey church using the stones of the old abbey on the same site. An oddity caused by this re-use is the uneven surface of the external walls. A coat of arms of the conjoined arms of the Eglinton and Campbells of Loudoun, in the persons of Robert Montgomerie and his wife Jean Campbell, is built into the church wall above the staircase that leads up to the Eglinton Loft. They may have been placed there to commemorate the building of the first the construction of the first church of the reformist faith.