It would be long story. Basiclly the DM stopped other contrys from devaluating (they had agreed to that). So most of all france wanted to get ride of it and have contoll over the euro. The would only vote for reunigicatin if germany agrees. This stuff is not well documented but it not a conspirecy theory either. I will update the post with some soures latter.
German politics is paid for by the manufacturing industry.
They needed a weaker DM and a stronger Franc/Lira/Peseta to sell stuff.
UK politics is paid for by the financial industry - they need more currencies to trade. A stable predictable and universal currency would kill the city.
Denmark stayed out because it was forced to have a referendum and sensible people always vote against anything that politicians are all in favour of.
Sorry not correct. Germany didn't want it. Im not sure about UK, I think they still have the pride of a I think they still have the pride of an empire.