Oh I see, 'biggest first' (otherwise known as the law of the Road) that's very democratic, I thought every country had a veto? How can any country have a slightly higher say? Come on Paul, Germany holds sway because it is the wealthiest country, the paymaster, it will dictate the direction of all the important parts of EU policy and that will always be intrinsically to protect the value of the euro, in relation to Germany's output.
That's the reason why, if we stayed in the EU we would not be forced into joining the euro zone as such, but all the EU policies introduced would certainly not favour the pound over the euro and we would be at a disadvantage with Sterling. Eventually majority voting will have to happen in the EU, with the power of veto restricted to only specific issues, e.g. like preventing other countries joining the EU. If the EU does not accept majority voting then it will grind to a halt.
Hence because of this eventuality, Britain would lose the power to opt out, or alternatively would find itself opting out of so much it becomes merely a spectator, also it would not have its rebate recognised and would come under great pressure to eventually join the Euro zone.
Retaining our own currency is vitally important, its a barometer of how the country is doing, Brexit has contributed to its fall, but as you said it was over valued because a lot of the jobs created by the Tories are fleeting, uncertain, seasonal, they come and go, involve zero-hours, or are low paid jobs and undertaken in many cases by low skilled immigrants, doing the jobs that the Brits apparently don't want to (certainly not at low rates and zero hours anyway) do and probably most of whom will return home when the work runs out. One of the reasons comrade Jeremy has opposed the EU for most of his political life was because it was seen as a source of cheap labour, which undermined the British workers negotiating position...apparently!
Being in the EU has allowed the Tories (and Blair) to get away with it, once outside the EU any crutch like excuses British politicians make about employment etc. will ring hollow and the public, should it wish to, can vote out the miscreants, but which of course we can't do the same with the EU commissioners!
Sorry Paul this is ludicrous, there has been a problem in the Island of Ireland for centuries, admittedly involving the UK, but long before Brexit and who knows Brexit might well turn out to be a catalyst for finding a permanent solution.