It seems quite complicated. There seems to be some ongoing due diligence checks and I think the deal hinges on Ron Martin still having the land at Fossett's Farm to redevelop for housing.
Either way, if I was a Southend fan, I am not sure I would be too impressed by the prospective new owners - who seemingly have exchanged contracts and ploughed money into the club without actually completing the sale. It seems a bit naïve to me...