If you're Gluten Free, go to the other Singl-end in Garnethill. Merchant City say that they're Coeliac friendly and have GF-available on dishes, but when you order those dishes Gluten Free they then say they have to take a lot of ingredients out. Which would be fine, except when we went the chef refused to do the swaps saying it would be too much work.
So despite what my previously excellent experience of Singl-end was (from going to the Garnethill branch), do NOT go to Merchant City if you have Coeliac.