Bedford Town Bridge
After all the advice I had over previous uploads of this bridge (thanks all), I went back again (After they'd turned off the christmas lights!), reshot it and had a play in CS3. The main problem it seems was the lack of detail under the bridge, meaning you had three black blobs that told your eye it was leaning as they were getting smaller. Funny how the mind plays tricks on you!
this one I am happy with!