Just a quick update as a load of bikes (including mine) were ticketed last night. I looked out a good legal challenge online - not sure if it will work, but from a quick inspection the argument hangs together and the lad has done a lot of legwork. Worth giving it a shot http://forums.moneysavingexpert.com/showthread.php?t=2617869 about half way down a poster called TheBogsDollocks.
Seems to hinge on the fact that there isn’t a defined parking suspension notice and councils tend to wing it which makes it hard to enforce.
Hope it helps someone