European Union Referendum Bill

I have some sympathy for providing as much information as possible during the referendum, but is my right hon. Friend aware that probably the most definitive assessment of the costs and benefits of leaving the European Union has been provided by Open Europe? It says that on the one hand there may be benefits and on the other hand there may be disbenefits, depending on what assumptions are put into the calculation. How does he expect the Government to come down on one side or the other, and which assumptions would go into that assessment?