Hi Judy, thanks for the reply. My oven does run true to temp, plus or minus 2 degrees. I have checked it with an oven thermometer and my husband has a fancy commercial gizmo that tells the exact temperature.
I am puzzled because the glossary at the front of the book states that oven temperatures are given for fan forced ovens. I don't think I ever read that part of the book before, so I am thinking that the last couple of times I have made this recipe I assumed the temperature referred to a conventional oven, and thus reduced the stated temp by 20 degrees. I guess a lot of bakers would have done the same because most recipes refer to conventional temperatures if it is not specifically stated.
Anyhow I have made a note on my recipe so I don't forget next time. Thanks again, I will check out your link later. Guests will arrive shortly.