Brown & Polson Cornflour in the larger 500g pack is the family-size pour of the British thickening staple — the same finely milled cornflour used to thicken gravies, sauces, custards, puddings, and stews. The standard method: slake a couple of teaspoons in cold water before adding to hot liquid, then stir until thickened. The 500g pack suits regular bakers, big-cooking households, or anyone who hates running out mid-recipe. Brown & Polson has been a UK kitchen staple for over a century and a half — the cornflour your grandmother probably used.