I'm a little appalled at one or two of the things I've read on this thread, like
"National Institute for Health and Clinical Excellence had previously (2007) said 1.5 units per day was OK"
And the reason there is now complete hysteria about consumption of any alcohol? Because it was thought that women would find this too confusing, bless their pretty little empty heads. Better to abstain entirely.
"the Royal College recommends that the only way to be absolutely certain that your baby is not harmed by alcohol is not to drink at all during pregnancy or while you are trying for a baby."
Do they now. I assume they are also aware that the only way to be absolutely certain that your baby is not harmed by food is not to eat at all during pregnancy or while you are trying for a baby.
And also that the only way to be absolutely certain that your baby is not harmed by breathing car exhaust fumes is not to breathe at all during pregnancy or while you are trying for a baby.
The concept of absolutes is ridiculous in these situations. Each pregnant woman has the right to decide for herself how much risk she is willing to accept, and what her own actions will be to mitigate any risk. I may disagree vehemently with another woman's choices but I would defend to the end her right to make them.
The landlady's actions suggest that she would treat all pregnant women the same way, whch is to discriminate against an entire group. Illegally, I presume.