I'm afraid that the smug "well, the rest of Europe will be waving bye bye" attitude doesn't really help, and nor does the insistence on portraying everyone who questions things like the Common Currency as a xenophobic bigot, since I think most people outside a small core of readers of certain papers who still hate the Germans would have no problem with free trade, in fact that's a concept that Britain has always been all in favour of, it's just that people really don't like having regulations imposed on them by another layer of Government on top of the already incompetent one they already have. I do wish that pro-EU supporters would be able to understand that, and not just dismiss everything with "the rest of Europe is getting ready to wave goodbye".
The single currency is not really a problem, having an open market with different currencies was. In the good old days all it took is for the Italians to devalue the Lira and bang, a few thousand workers were unemployed in Manchester because British cloth maker could not compete at the new Italian price. The only thing that went wrong with the common currency is that it came at the wrong time. You first put in equal rules for all and then you have a central bank for all having the instruments in place to oversee the rules and fine where needed.
But that was politicking at the time, the Germans got the reunification and the French the Euro...15 years too early.