The only flight school in Dubai is called Emirates Aviation Services I believe. THey currently follow the FAA syllabus but are soon going to switch over to and follow the British curriculum. They charge approx Dhs. 600/hour.
They seem to have more students than they can handle so I'd recommend you check if they have any available slots. I took a few flights there and it was great! They seem to be very thorough with their safety procedures and the instructor knew what he was doing..
Hope this helps.