European Union Bill

I understand the logic of my hon. Friend's argument, but, given the profound changes since 1975 in the prospectus set out by members of all three parties in the House, is there not now a thirst among the public for a referendum, either on whether we should be in or out of the European Union or on some of the other issues of major constitutional significance—from the Single European Act to the Lisbon treaty—on which they have not been consulted?