I would recommend the international school of london-we have been there and they are striving to do right by the kids depending on theri national and cultural backgrounds, plus the lcasses are small, and being on eof the most expensive schools in Qatar, it will possibly remain small in numbers, and i think thats good for one-to-one attention to pupils. Visit each othe schools and make your own mind; do it with your child so that hse gets a feel for the school that you end up choosing.
best of luck