With youthful idealism I voted to join the 'Common Market' hoping that it was a first step towards a United States of Europe. Too many members of my family had died in unnecessary wars. I certainly didn't envisage the pointless expansion to include disparate nations that bring nothing to the group. I am hugely frustrated by the administration and lack of control over it. It is very far from the ideal I had hoped.
Trade with the original constituent members is strong and mutually beneficial. Like the UK these are post Empire countries and each alone is far weaker than they were in past times. The UK has some major advantages, a language is that taught throughout the world, most importantly by the world's strongest country economically ( and widely in other major economies, such as China, Japan and India).
The UK is seen as a stable base by non EU countries to use as an entry point into Europe - sometimes referred to as an aircraft carrier, it is a pleasant place to work and live and has a business friendly regulatory regime (relative). That is the major reason why there are so many foreign companies based here, financial as well as industrial.
Without the former advantage of commodities from Empire countries, often produced by UK owned companies sending dividends back. the UK is not a particularly strong trading nation. Nowadays many of the main manufacturing companies in the UK are foreign owned. Powerhouse Britain can't build its own power stations, on its own cannot produce airliners, much of its rail capacity is serviced by foreign manufacturers, major British car manufacturers-who they, steel companies- oops, we can assemble electronic equipment but that can be done cheaper and unfortunately, better elsewhere. Where do we excel, weapons-no, highly skilled and motivated workforce- no longer. Financial expertise, we're good at that. Hasn't everyone noticed that most financial decisions are now driven by computers using analytics based on 'Big Data'. Those computers can be based anywhere. The financial sector is being de-skilled and rapidly.
I am English, I am British and proud to be both. I would like my children and their children to live in a safe and economically strong country. Clearly there need to be effective and fair immigration control. We cannot afford to support those indigenous people, only qualified to do the work that migrants are doing but not prepared to accept their wages. We cannot afford to support all the world's poor. When you are struggling to support your own you can't fill up everyone's collecting tin, no matter how worthy the cause.
To say that" trade will not be an issue" is to advocate taking an enormous risk driven by an overinflated view of our current strength based on historic facts. Politically we should be seeking to provide strong leadership to Europe, towards the common good rather than self interest. That way hopefully we can build the strong alliances that will be needed both politically and economically.
Now realism not idealism.