Lost the tip of my distant pillar when I did the final render; eventually managed to retrieve it when I got the right shape crop around it for the supplementary crop render. Stitched it back on in Photoshop (Yes, it did hurt).
Yep, Eoin, there's a few jpeg break up lines in the bottom right corner. For your info: AA was at max 11, and, no I didn't apply any post sharpening in Photoshop.
John