Madly, may I ask if you plan to have more children after this one?
I'm not asking you to be pursuaded by asking this, but simply consider from a separate point of view, different to yours, but experienced by many people, not only in this thread but around the world.
What would happen if your child, the one you are carrying right now, did turn out to be born with FAS/FAE from your occasional drinks? Would you perhaps consider the other point of view and then believe that any amount of alcohol is not safe? All scientists and doctors everywhere agree on that matter, which is why it is the first statement always made, before your UK recommendations say one or two a week is fine.
What I'm asking is, what happened if the child you are carrying now happened to be born with FAE/FAS from your few drinks? Would you then continue to drink during subsequent pregnancies, or would you take the other side and advocate for the children who are victims of this preventable disability?