That diarrhea aid would be the same as people's Kaopectate. Not sure if they have that in the UK but just look for the active ingredients.... kaolin and pectin.We tried it for Bryco, I didn't feel it did much. He was on it for 2 months...But he was also still on a kibble at that time....so maybe it does work. I hope you find something to help her hun...I wish I could ship you a few bottles of the puppy diarrhea aid I used for him...it was incredible and I was SHOCKED & so very thankful with how well it worked :-/ its this stuff: NaturVet Anti-Diarrhea Aid for Pets at PETCO maybe you can find something similar?
Active ingredients per 2 tablespoons: Kaolin 5.8 grams, Pectin 0.26 grams.
Inactive ingredients: Citric Acid, Cranberry Powder, Glycerine, Natural Flavoring, Potassium Sorbate, Purified Water, Sodium Benzoate, Sodium Carboxymethylcellulose and Sorbitol.
All I know is it worked wonders and really seemed to calm his tummy. I mixed about a teaspoon with a teaspoon of yogurt and a teaspoon of pure beef baby food and viola...better!