Is my right hon. Friend aware that the duty on Ulster vehicles going into the Republic may amount to £1,000 or even more and that it is not recoverable? Is he aware also that the Board of Trade has been pressing the Dublin authorities, by correspondence, to give equitable treatment to Ulster for many years? Does he not consider that it is about time that he addressed them in the only way they can understand, and that is by the imposition of a quid pro quo on their vehicles coming north? Or are we to allow this injustice to be perpetrated in perpetuity?