Half the people over here who cook cannot make a proper sauce i.e. with homemade stock or a roux they use packet gravies then add to them ,if you can find a chef over here then you will get your good sauces ,there are a few cooks who are better than the others ,if i was hiring in the u.k. i wouldn't employ any of them .
Cooking Turkish food they might be okay ,some of the Turkish meals i have had have been great but they are rubbish at doing foreign foods especially ones with sauces ,it is not all there fault its the greedy owners wanting more .after saying that ,no one cooks chinese better than chinese ,nor indian or thai each to there own .