I would suggest, rojash, that your contention that “...most people involved in the political world are aware of the realities of life in a global economy,” is somewhat misplaced.
Most people in the political world (again with one or two honourable exceptions) have no idea whatsoever of the realities of life, either in a global economy or anywhere else. Many of them are career politicians who have graduated to Westminster either via local authorities or as interns to sitting MPs and ministers. A large number of them have never held a job of any sort outside that small world and have no notion whatsoever of the problems that businesses (especially small businesses) in the UK face today courtesy of EU generated regulation and control, which the UK authorities generously “gold plate”. For them the “global economy” is a set of monthly figures on a spreadsheet (probably with a nice looking chart created from the data for them by one of their lackies so that they do not get troubled too much with the numbers, The lackey, of course, aspires to and will no doubt achieve a position similar to that of their master thus ensuring that the whole farce remains intact.
It is the people of this country, the employees, the managers, the entrepreneurs, the businessmen (small and large) that keep the UK going, and are aware of the realities of life in the UK. It is they to whom MPs should listen and make sure that their views are widely known in Westminster.