"here is a handy, dandy tip"
As your people say, leave it for 12 hrs it really does work to give it the best set. I used to make my own from one table spoon of live yoghurt and one of pint milk. I would add some gelatine or if I wanted, say butterscotch, after brewing it I would add to each lunch pot, one teaspoon of instant whip and place in fridge and bang 2 hours later they be set solid. I hope this helps you all - it also works during the Winter as I have a draughty cold room and yet they still they set.I hope this helps - well done Easiyo.