"If article 50 needs a vote or act it will get it or there will be hell to pay."
Dear Inmypjs, I'm not sure which country you're from, but the UK has a parliamentary democracy. I.e. parliament is sovereign (unless it decides to give up some of that sovereignty, usually through a treaty with another country or an international organisation). That means that parliament has to take the important decisions - any other process would amount to a major constitutional change.
Furthermore, MPs are supposed to represent the interests of their constituents, not their party or anything else. Admittedly I'm a bit hazy about the finer details of that, but it strikes me that their vote in Parliament would depend on the feelings about this matter in their constituency.
For another take on this: in 1975 Margaret Thatcher commented "Perhaps the late Lord Attlee was right, when he said that the referendum was a device of dictators and demagogues."