Lucy, you can make a seriously nice risotto using cauliflower rice, you just need to think 'back to front' - first you need to make the sauce, quite thick, for example if you make a mushroom risotto:
Fry onion until golden, add sliced mushrooms, fry until lightly brown, add dried porcini mushrooms (if you use them they need soaking in water first), add philadelphia cheese or double cream, finely chopped parsley, a little finely grated lemon peel. This will give you a thick, slightly gooey sauce.
Grate a raw cauliflower to resemble rice grains, cook in the microwave on high for about 5 - 6 minutes, add a few splashes of Maggi liquid seasoning, little bit of salt and butter and stir into the mushroom sauce, top with freshly grated parmesan.
Do the same with a ham and leek risotto, etc - it really does make a lovely risotto that doesnt taste like cauliflower at all.