Thank you all for the comments. As for how I took it - here's my technique perfected after years of thought and analysis... OK well maybe not that. I'm a lazy bastard so I have a lazy pano technique that requires no gear other than your camera and a little bit of practice.
- Set camera to continuous shot
mode
- shoot vertically
- Set the aperture
- Point at the centre object in your final pano (ie the middle of the scene) and get a focus lock
- lock the focus
- rotate your body (not your feet) to extreme left
- fire your first shot then pan right pressing the button down (rat-a-tat-a-tat) twisting your body not your feet
- If your camera slows down due to buffering slow your pan, but don't release the button
- convert shots to TIFF (no PP)
- load into
PSCS 3(Automate/photo merge)
- crop and PP as per usual (in this case I had some barrel distortion i tidied up using the warp tool)
So no fancy schmansy pano rails or tripods or anything else. Easy eh!
Mark: No HDR - just standard stubbsy PP on this
Bernie: I wondered about the horizon too - went to straighten it and discovered it was basically level so a kind of visual illusion.