Firstly, we are an alternative market. If the Euro has a bad quarter or two then the global trading comanies can trade with us knowing that we have no assets or connections inside the EU, Global companies don't like to put all their eggs in one basket so they will always put aside a small investment to us, if all multinational companies do this then we will find a great benefit in total.
Secondly, we can remove some of the manufacturing regulations, this will attract companies in other countries that don't meausure up to EU standards. So we will get loads of goods that the EU blocks.
Thirdly, The European commission can't control some of our public spending so instead of sending money to the EU and getting a rebate we can control how investments are made at the ground level. So we can say no more art galleries and statues and more transport links and so forth.
Fourthly, Our global trade deals won't be a best fit compromise of 28 nations. It will be good for us only. For example. we can drop the import tarriff on medical comodities and exotic products that we need cheap and raise the import tarrif of processed foods and aicraft parts and that we export. That is good for us and bad for others, but now we are alone so no more compromise.
Fithly, we can focus on our assets now, this couintry is a very good place for generating natural energy. We have the strongest winds in Europe, and strongest tides. We have hot springs (in Bath). We have lots of empty valleys to buid hydro electric dams and we have lots of roads and railways to suspend solar panels above. Technology will reinvent this land.
Sixthly, If our needs change in 5 years we can change our spending and policies very quickly. If you are in a block then you can't adapt to change very fast because the tranding block needs time for negociations.
Seventhly, We are in a union already and we can form other trade unions with other nations outside the EU.Like Moroco and Algeria. They have goods to export and so do us.
the future is bright