London - At the airport. En route to another critical meeting. Fast food is everywhere, and unavoidable. Even celebrity chefs producing the world's most-praised meals have an occasional hankering. So where do they get their fix?

We asked them, and alongside the predictable Shake Shack and KFC were some surprising results. More were notable by their absence. We're looking at you, McDonald's. The Big Brands ...

Vineet Bhatia (Indego by Vineet, Dubai): Pret a Manger - a British sandwich chain that has reached big cities in the US, China, France and Dubai. "The food is always fresh, with a good choice. It's quick and tasty and the staff always smile. I like their hoisin duck salad wrap and their chicken avocado sandwich."