Excellent question True Blue, interestingly at BHD this morning I was going through enroute to LHR, some people were doing market research, with one question, from which country did you start your journey today, so they may well be trying to get a sample on that stat, they were surveying 1 in 5!! However, without a comparable metric from last year, the results may not answer that question!
I'm not convinced the penny had dropped re the change, and the rate is turning this week, after some changed since Brexit vote. A great indicator will be if there is an enormous pick up in shoppers going to Newry and Strabane for Grocery shopping!