Hi Lee - the Lucozade gels are supposed to be (says on their website). I am not coeliac, but my wife is and is a runner, but for the record, I rate them as best anyway. SIS Go Gel are also apparently Gluten free, but contain Xanthan gum which I know some coeliacs react to - and again, for the record, though easier to take, especially on the move, they do not have the same carb content and I find them less effective.
Hope this helps