Number 1 is use buttermilk, apparently this really does make a difference, but never having had scones made any other way, I personally don't know.
Number 2 is to use a knife when you're cutting them, not a glass, as this compresses the edge and stops them from rising.
The scone is very similar to the American biscuit but the biscuit doesn't have any sugar in it and you use plain flour, baking powder and baking soda.
Anyway, this is the first time I've made scones and I thought they turned out well. I'm posting a very simple recipe straight after this one which will show what I did with the scones.