In essence, not having a veto is not having control on the outcome. An agreement would be negotiated for us that we would either have to live with or reject. There is no sensible outcome we could live with over which we have no control.
It gets worse. Turkey can sign free trade agreements with other non-European Union countries only if she has the EU’s permission—we would have to get clarity on whether that would apply in this instance. I suspect Turkey only subjects herself to such a humiliating state of affairs because she continues to hold out the hope of becoming a full member of the European Union.
The state of affairs for Britain would be far worse, infinitely worse, than remaining a member state of the European Union, where we at least have a seat at the table when it comes to our trade deals.