From my view I cannot see any group sufficiently organised other than the government making anything happen at all. I appreciate that does not say much(!), but quite honestly none of the opposing parties to the deal on the table have the remotest idea on what to do next. It may be unopular to say this but Mrs May has an almost impossible job here and no-one seems the least bit interested in trying to bring about a concensus. The ERG are as likely as not to fail in their decades long desire to leave the EU with their take on things at present. Corbyn doesn't seem to know what's going on even on his own backbenches and amongst the rest is a scrabble to see if they can get a spot on Newsnight or similar programme and tell us what cannot be done. The entire political establishment at present is doing itself no favours and certainly letting the country down badly.
The uncertainty needs to end, get the deal agreed over the line, get businesses a line to follow and let's get on with what really needs doing in this country, there are plenty of things to do!!