Is the british corn flour the same as American corn starch?

No, British corn flour is not the same as American corn starch. In the UK, corn flour refers to what Americans call cornstarch, which is a fine, white powder used as a thickening agent. Conversely, American corn flour is made from whole corn kernels and has a coarser texture, often used in baking or cooking. Therefore, it's important to use the correct term depending on the recipe and the country of origin.