Switch on yoghurt maker to warm up before you start.
Put 1 litre of milk into a jug or the dish for the yoghurt maker. I have used UHT versions of milk as to use non UHT means that it would need to be heated up. Keep UHT milk at room temperature and not in the fridge, unless it has already been opened..
Optional: Heat the milk gently in the microwave for a minute to take the edge off how cold the milk is.
Stir the milk, and add the live culture and skimmed milk powder.
Stir thoroughly and place the lid of the yoghurt maker on.
Leave for 8 hours and come back to lovely thick yoghurt.
Put straight in the fridge to chill for later.
When chilled, add any sugar, fruit or spice to taste, it can also be used for cooking.