I looked it up on the Tescos website:
Ingredients
Quark Skimmed
Milk Soft Cheese, Strawberry (6%), Water, Cornflour, Natural Strawberry Flavouring, Concentrated Lemon Juice, Concentrated Black Carrot and Carrot Juice, Sweeteners (Acesulfame K, Sucralose).
I would never say never

but my prefered alternative would be 10% fat Greek yog, preferably sheep's milk, and if I wanted fruit flavouring on it, I would go for an actual strawberry. But then I don't get on very well with the sweeteners mentioned in the ingredients list. Maybe as a one off? But not regularly, for me, my body, and my circumstances.