If you have 10 hours get yourself out of ther and head to Dubai mall. If you hold a British passport it is free to exit in Dubai, check your hand luggage into the property hold and get a taxi over, there is so much to do at the mall not just shopping. Aquarium and art plus fab restaurants outside by the 'lake' in the shade of the burj khalifa ( you can go up this as well if you like, we've done it and its good) and if its after 6pm you can see the dancing fountain show. Definetly worth a visit, 10 hours, even in an airport as equipped as Dubais will be boring