
You can make the puddings ahead and keep them in the fridge, covered with cling and unbaked for 24 hours. Just give them the full 25 minutes to cook. Handy if there is only two of you eating or you needs to get ahead.
If you haven't got a reliable oven or an oven thermometer, check the puddings a couple of minutes before the time is up - you don't want them dried out and cakey.