This yoghurt contains cornflour so I'm not sure if that is gluten free or not. Sainsbury's website states:-
Dietary Information: Contains milk. Not suitable for nut allergy sufferers due to the methods used in the manufacture of this product.
Ingredients: Senga Strawberry (18%), Sugar, Whipping Cream (from Cows' Milk) (7%), Strawberry Purée (6%), Cornflour, Lemon Juice.