If we leave the EU they are not going to give us a free trade agreement for free
They sell more to us than we sell to them. They would be cutting off their nose to spite their face.
Worst case scenario is that we default to world tariff prices which IIRC is only about 2 or 2.5%.
I hate the idea that if we leave then we have no voice within the EU which account for 50% of our trade.
Put it another way: if we leave then we can forge great deals with the Rest of the World, which already accounts for 50% of our trade. Our trade with the EU is declining - why do you want a 'voice' within a declining market, let's go chase growing markets.
The EU has convinced you that we cannot survive without them. It's like an abusive relationship. Let's LTB.