You'll be fine mate Dubai? It's just like any other airport in the Middle East, only 100 X bigger It's full of duty free shops selling high end designer goods and swiss watches, electrical goods ......etc all at prices far higher than you would pay in the UK. Even the ciggies arent cheap, £10 for 200 there, compared to about £6 in the Phil's. Also be prepared to pay at least 18 Dirhams (about £3.50) for a cup of coffee.
Gone are the days of the middle east being cheap. back in the nineties I used to go to India a lot via Bahrain or Abu Dhabi, in those days you could get some real bargains, but these days I reckon Britain is as cheap as anywhere for consumer electrical goods.