Just baked this one, what a nice change from heavier scone recipes I've tried, very light and tasty and yes, if you are baking in a convention oven - WATCH THEM! Mine took about 11 minutes. I didn't have vanilla yoghurt so used 4 small multi fruit flavoured ones and all spice versus cinnamon because I was lazy to grind fresh. I didn't use a muffin tin, just blobbed them on a oiled cookie sheet - made 7 nice sized scones that turned out great. Definately a repeat!
This recipe is more of a cross between a muffin and a scone as found in Australia and NZ being lighter than usual. It is also a wetter mix than your usual scone dough. Despite a large amount of cinnamon, the scones were not obviously cinnamony. I did not have a clean muffin tin available so I just put large tablespoonsfuls on some baking paper which worked well. If you have a convection oven, you will probably find that you only need 8 minutes baking time. I had stopped the oven at 10 minutes to find that the tops had burnt a little.