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I guess. I think it a loaded question as it depends what state we were in.
When we joined we had declining trade with our traditional partners in the common wealth and US, and increasing trade with Europe. Europe had been enjoying stable growth while we we're bouncing up and down with most of our cities still in a shit state from the blitz.
Now we're an incredibly developed, prosperous country. So its hard to imagine us not being in that position and see what extra benefit it would bring us.
That said now is not exactly an attractive time to join the EU.
Someone asked me today, if we were outside the EU and this referendum was for joining, would I want in? Interesting slant on the in/out question.