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That`s actually just what we do want Tom, "isolation" from the EU`s foreign bureaucracy, their relentless churning out of directives, ( although they have to do that in an attempt to justify their jobs in the first place of course! ) restrictive red tape, being told what we can and can`t do whilst at the same time paying vast sums of money for that pleasure. However, we would not be isolated from europe itself of course as we would still trade with those european countries much the same as we have always done, similar to the way that Switzerland and Norway do now but without the restraints that the EU imposes.
You ask " what is so damned attractive about the UK itself? " If you mean to immigrants, then obviously that`s a better standard of living, either higher wages for those that work or benefits for those that don`t, free health care, schools etc., etc. and yes, even richer pickings for the criminal element that make their way here.
Perhaps the influx of inactive migrants is not quite such a big issue in some of the other european countries because a fair number seem to make their way here. The EU thinks that it has attended to this issue by just letting those concerned settle wherever they wish, but in my opinion that doesn`t actually do us any favours.