The man is running his business in London, ingredients from a London market, employees living in London, using London water and power, using the Pound to pay for things. The "critics" need to realize you are eating Asian food in London!     Until you as a different NATIONALITY (Asians included) book a flight to (Asian country of choice) walk to a village or town be invited into someone's house sit down with them and eat their food that their 90 year old grandmother cooked up you can't really talk about "Authentic" when you are looking for food and overall environment combined.