use "I can't believe its not cornflour"
The only alternative to cornflour I know is to mix equal parts of softened butter and plain flour to form a paste and use the paste instead of cornflour.
A little cornflour will do the trick.
I personally would use normal cornflour instead because wheaten cornflour is really hard to find but you may wish to use something else.
diabetic people can use cornflour and custurd powder?
NO
Not in all recipes; for most baking recipes substituting plain flour for cornflour will not work, since cornflour has no gluten (which is what makes dough springy) and it requires far more hydration. Adding some cornflour to the flour in baking will result in lighter baked goods, but only until the total flour is 5% cornflour; after that the baked good gets progressively more dense and inedible. Cornflour is useful for thickening custards, which plain flour is not so good at. But you cannot bake normally with cornflour. Both cornflour and wheat flour have a similar calorie content, wheatflour is lower in the glycemic load (GL) index compared to cornflour, and whereas cornflour is considered "highly inflammitory" (i.e likely to cause a reaction), wheatflour is only considered "inflammitory."
to thicken food use cornflour or cornstarch
I'd use regular flour.
NO, totally different thing use bran
Find out.
It helps retain some moisture
yes