I am based in the UK and there are several yeast products here which are gluten free and readily available. I always use either the Allinson's Easy Bake Yeast or the Dove's Farm Quick Yeast. You can also use the Allinson's Time Saver Yeast, though be aware that you may not need to prove the dough for as long if you use this. The Dove's Farm one is certified gluten free and found in the free from aisle. The Allinson's yeasts are free from gluten and can be found with the 'regular' baking goods.