I have been told mixed messages that if you have a British passport he will receive better pay?
That is true. I live in a city close to Abu Dhabi, and in this part of the world works like that:
There are 3 ties of wage for the same position, according to your passport:
1st Tier, Best wages: If you are American, Canadian, Japanese, Australian, Western European or Emirati.
2nd Tier: Middle Wages: If you are Eastern European, Russian, Latin American or Korean
3rd Tier: Lower Wages: If you are African or South-Asian
The difference between the tiers can be as high as 50%.