Thanks fellas.

Deeno - the effect seems to be pretty controllable. It simply depends on whether you are tilted up, down or level in respect to your horizon lines. Of course, vertical straight edges will exacerbate it.
Well, I'm in the city about to go down to Circular Quay and meet my model friend for a days shooting of her in various dresses and costumes. Should be a blast. Damn this hangover!

LOL