I've read a lot of what Frank Field has written, but I am allowed to disagree, and can use well researched data to back my point.
The poor in Frank's constituency are not poor or receiving low wages because of the EU, there are many more reasons and I feel that Frank's analysis is not accurate, nor is it based from an impartial source, Frank was always a eurosceptic, he also used Migration Watch to make his predictions of future immigration.
You can use him as an appeal to authority but I don't think he's correct. I think that the inflation coming in the next year, economic uncertainty and austerity now lasting into the next decade will have far more of an impact on the poor than of immigration and I think Frank Field was at best misguided and at worst deluded if he thinks that Brexit will benefit the poor.
He also thought that no government would try and lower working conditions standards, whoops, there is JRM saying that's what the government is looking at.