No as has been confirmed we remain the 5th largest global economy and 2nd largest EU economy.
It seems you have ignored your original premise and my reply, we are the EU's biggest market to sell their stuff to, we buy net 62 billion pounds worth of their goods from them as compared to what we sell to them.
So I suspect there would be some priority to continue to trade with us.
I hope your right.
And so do 64 million other people.