I had heard that when Tesco pulled out all the small retailers also backed away. Naturally as that's just what I heard I have no idea what went on behind the scenes and at the council meetings.
I assume all the minutes from all the meetings involving every stage of the development, that has gone on for years, are available to the general public. Reading the minutes, or attending council meetings, It's not something I have ever thought I could pass a few hours/days of my time doing.