If it lists fructose in the ingredients I would avoid it. Yoghurt ids OK up to 5% "sugar" because that is lactose (milk sugar) which is metabolized to glucose. The flavoured yoghurts should be avoided.

agreed, your best off avoiding those types of yogurt.  You can buy one, it's Tamar Valley brand with no added sugar, it does come in different flavours however it does contain artifical sweeteners.  Instead why not go for normal full fat greek yoghurt with frozen berries.  To begin with I mixed in some dextrose and a splash of vanilla in my yoghurt.  Now I don't have any at all, although I do like a spoonful of cream mixed in and some vanilla.  Defrost some frozen mixed berries and you have the best yoghurt!

Can anyone help me I don't like milk to drink or to have on my cereal, I do have Nestle Diet Yoghurt on my cereal is this ok or should I be having another type of yoghurt I

Yoghurt is OK to about 5% because 4.7% id milk sugar which is metabolised as glucose and therefore OK.  Just avoid the flavoured ones because they have the flavour replaced with sugar and salt.

I would go a different type of yoghurt like greek, sweeten it with vanilla and dextrose or rice malt syrup to sweeten it up a bit.  You can easily make your own museli and I've done it a few times.  Melt some butter with rice malt syrup.  In a bowl mix some rolled oats, sunflower seeds, pepitas (or any other seeds of choise), shreded coconut and some crushed nuts (I like crushed almonds and cashews), you and also mix in some dextrose depending on how sweet you want it.  Mix in melted butter.  Spread on tray and cook in moderate oven until golden.  It will keep well in the cupboard in an air tight container.I love it with some greek yoghurt and frozen berries.