Sushi (although check sugar content of the vinegar they add to the rice)
Sashimi
Some of Nandos foods are gluten free - I think some of their chicken is & their chips are. (a guy at work just diagnosed a coeliac & Can have nandos)

That is all I can think of off the top of my head. I'll see if I can find out some more stuff from my gf tomorrow who has a gluten intolerance and see what she eats if out.