Nandos is one of the best places to eat GF in my opinion. They are very diligent about always having a manager take your order, they clean the whole grill before use, and your food comes out flagged with the allergen. There’s also a wide variety of options (well, as much variety as there can be at a chicken restaurant), and the food is really good - I am celiac and have never been glutened here.
Nandos is my go to. The staff are always so attentive and don't make you feel like a burden or a second thought.
Manager takes the order. Goes over ingredients and always explains that they will be cleaning down the grill. Often they'll let one of the kitchen staff know while you're at the till.
Mainly chicken dishes of different kinds with sauces of varying heat, but also vegetarian options. Many gluten free alternatives that are marked in the menu for easy selection and you are encouraged to order at the counter to make sure there are no mistakes. The staff were knowledgeable and helpful, and the food tasty and suitable for kids. Bottomless ice cream dessert (and of course other kinds as well) and reasonable prices. An easy restaurant visit for someone avoiding gluten.