A lot depends on Brexit. I think Mrs May will be able to use smoke and mirrors for quite a period, but then it depends on whether the customs regulations can be squared up, quite a feat really, once we are a 'third country'. I know the right wing are talking about importing EU regulations (hence, convergence), but what happens when we start to diverge? Will our mythical truck, driving from Slovakia to Manchester, continue to pass borders 'frictionlessly'? Somebody told me the queue over the Russian border is about 3 days. Nobody knows.