Since the referendum a number of polling organisations have revisited the underlying questions and attitudes. These, in alphabetic order, published opinion polls or polls of polls before the referendum.
“We are the leading research consultancy specialising in Corporate Reputation, Public Policy and Communications”
A well established polling organisation with some commentary pieces
“Opinium is an award winning strategic insight agency”
“Populus was formed with a simple idea in mind: in order to succeed, organisations, businesses and brands must first understand what matters most to the people who matter most to them.”
“80 years of listening to Britain”
“Non-partisan information on UK attitudes to the EU and the EU Referendum”
“YouGov is a community of 4 million people around the world who share their views …”
A frequently cited pollster with some opinion pieces to read.