This writer argues that EU membership costs Britain more than it gains (the person responding doesn't make much of a counter-case):
http://www.spectator.co.uk/2016/06/six-best-reasons-vote-leave/
This article highlights one of the points that I haven't been able to rally get a proper explanation about and still fails explain it - how has the EU prevented the UK from exporting to the rest of the world, and how will it be better once we have left the EU ?
So taking the first part:
It’s a costly failure. In 2006, the EU was taking 55 per cent of our exports; last year, it was down to 45 per cent. What will it be in 2030 — or 2050
The proportion of UK exports (it's not clear whether this includes oil) going to the rest of the world has increased significantly in the last 10 years - I don't see how this supports the claim that the EU is stifling UK exports to the rest of the world.
Now let's look at the the bit about tariffs....
We have always been especially badly penalised by the EU’s Common External Tariff. Unlike Switzerland, which enjoys free trade with the EU at the same time as striking agreements with China and other growing economies, we must contract out our trade policy to a European commissioner — at present, as it happens, a former sociology lecturer from Sweden.
Let's for a moment ignore the fact that, in order to get that "sweet" trade agreement with China that Switzerland has to make large per-capita contributions to the EU and that it has to allow the free movement of EU citizens - which means that the UK operating under the same model would still have the "costs" associated with EU membership without the ability to influence EU policy.
Let us also ignore the fact that, post Brexit, the UK would have to renegotiate all its trade agreements and bear the full administrative costs of doing so (and during the years while the negotiation is under way not have a working trade agreement in force).
Let's also ignore the unnecessary swipe at the EU trade commissioner. It's unbelievable that he personally would make the judgement, but rather his team of experts, so his past job is irrelevant - will the minister in charge post-Brexit be any more qualified ?
No, let's just consider those trade barriers. As an "innie" I'm happy with the idea of free trade but it seems that the Brexiters seem to think that our trade imbalance will be reversed by allowing China freer access to our markets.