Thank you all for your replies. I wasn't expecting so much +ve feedback as I am no Pro. Andrew I managed to get rid of the red fringing around the trees on the right side. I had corrected the CA in ACR but I had to activate the defringe all edges to get rid of it completely. I am finding it very difficult however to get rid of the halo around the tower. The image is a composite from the same raw image, one adjusted for the foreground and one for the sky, with a mask applied to the latter in photoshop. What do you mean when you say tone down the HDR? How do I go about it?
Etienne