Your oven ought to be at 200C. 

Chop butter into the flour, get your fingers into it and squeeze it all through till the mixture is coarse and chunky. Add the rest of the dry ingredients then use a knife to mix in milk.

Gently shape stiff mixture on a floured board or the bench top, cut into the right size chunks (up to you) and place on baking paper on a cold oven tray. Bake for about 12 minutes.

Got some boys coming over to watch rugby? These will go down beautiful heavily buttered with a Speights.