These scones are baked at a higher than normal oven temperature which gives them a wonderfully crisp outside crust. (joyofbaking.com)
Someone ought to bottle it and sell it... Anyway, I actually do have a fan oven but for some reason, turning the heat down never works out well for me so I just follow the temperatures for normal ovens (but that's just the way my oven is) Maybe you could try a 90c or 100c temperature and see how that goes? (wallflowerkitchen.com)
In a normal oven, you may want to start out at about 10 minutes and watch it. (bakinandeggs.com)