I'm being curious, rather than argumentative, but like what? I can't really think of anything personally?
Will Allsops cloud was stopped because of heritage fears. The first plans for King Edward tower (and the 2nd i think).
The Lime street regeneration was put on hold for a decade due to it. (the road, not the area around the station - that had other issues).
Edge Lane has been stopped from being widened in areas due to the types of houses it would have had to bulldoze.
The city then went through a great little period of building anyway - Liverpool One, the Met Quarter, Mann Island, Old Hall Street and the ongoing sensor city.
The credit crunch outright stopped 2 major schemes (jennifer & central village). Jennifer, albeit in slightly scaled back form, has been able to pick back you again.
But CABE (manchester based) and English Heritage (London based) have interrupted/delayed/stopped quite a bit of work in this city.