It seems to be quite hard to find out which store brands (BrEng: own brands) are made by Ontex - they have a large chunk of the UK sanpro market, but the information on nappies is harder to find out. We buy Boots and Tesco own-brand (Boots is a drugstore chain; Tesco a supermarket) - I can find out that KimberleyClark make Boots' nappies, but nothing on Tesco (from quality and packaging similarity I'd say they're likely the same manufacturer, though). I have a feeling Sainsbury's own-brand might be Ontex, and if so, they also leaked for us! But we had a particularly fussy baby when it came to fit. :)