What is all purpose flour in the UK please?

"All-purpose flour" in the UK is typically referred to as plain flour.

It's a general-purpose flour with a lower protein content than strong bread flour, making it suitable for a wide range of baking applications, including:

* Cakes

* Cookies

* Pastries

* Sauces

* Batter

You might also find some brands specifically labeling their plain flour as "all-purpose" in the UK, but the term "plain flour" is more common and widely understood.