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Brian, as to some points you made:
Not all EU states use the euro. Poland has the zlotti, Lituania the Lit, to name two.
Young people travelling through Europe is an EU achievement: not so! My Dad was in the Army and managed to travel to Bulgaria on the other side of the Iron Curtain; and two times he took us, the whole family, from Kent to Belgium, on into Germany and to Austria, and further into Yugoslavia, and back. That was before Britain joined the common market.
As for myself, I can't afford to even go to Oostende in Belgium and back to see how fat it is, now that the EU is about.
As for receiving equal pay, may-be you should study the average wage of Eastern EU countries: it is about a third or a quarter of Britain and Western Europe.
Prices are also a lot lower there. But the difference in average wage in one free trading zone as is the EU is an economic catastrophe for us in the West.
No fair trade and commerce can be based on such a system, and add to that the fact that £5.93 an hour in Britain is the equivalent to a doctor's wage in the East of Europe!
It would be as if in Sussex the minimum wage ware £20.00 an hour: many people from Kent would go to Sussex to work, and many more would arrive there from Hamphire and Wiltshire.
It couldn't function for long!