The Architect seemed to be the major target and they have folded. So no one to sue and a criminal issue is a very different scenario.
I suppose they could try and sue specific individuals but usually that is tricky, and I would have thought they would have arranged their finances accordingly if they thought they were at risk.
You look for those with deep pockets and that would seem to be the local authorities.
I seem to recollect that a lot of the flats were sublet, not sure how that will complicate matters.