Okay I have had really naff ovens for years (rental houses). I have just got a fan assisted oven second hand and have no idea about how to adjust cooking times and temps. Main issue being, due to time of year, how to cook the turkey. I have seen a website that suggests reducing cooking time for turkey to 12 mins per pound for large birds at a temp of 150. Is this right? I really don't want to overcook it, nor do I want food poisoning. Please ladies help!!