The menu says they can prepare gluten free food, to later find out they actually don't. I came here with a friend who is celiac, ordered myself a sweet potato squash pie (£15) given that the menu seemed to guarantee my friend could have got something. Then it wasn't the case. She asked at the counter and there wasn't anything they could make. This doesn't really make sense, if you can't offer anything gluten free don't write it in the menu, we would have left and gone somewhere else but I had already ordered. I don't see what they gain from doing so, you'd just receive well deserved upset reviews.
A premise that doesn't specifically offer gluten free food won't say it in the menu, perhaps you can ask if they can but this wasn't the case, the menu explicitly specified they would offer gluten free food.