Instead of making your own buttermilk with milk and vinegar you can buy buttermilk and use instead.
You can make double recipe and when they are cooled wrap and freeze one, as it freezes well.
Note it will cook quicker if you use all plain flour (more like the 30 minutes) and slower if you used all wholemeal flour (more like the 40 minutes). All ovens are different and if you overcook it will be dry so what I do is check on it at 25 minutes and make a call when to check it next, so I catch it just as it is finished baking.
Made this again today and decided to sprinkle cayenne pepper over the top before the cheese and then a little rock salt on top of that. I really liked the result. - 11 Oct 2011
got this off of the US site but tweaked it to reduce sugar and add taste. Now I love this recipe so added it here to have in my recipe box - 15 Sep 2010