I never saw that lady again but I'll be forever grateful for passing on such valuable information.
The recipe below is my adapted version of the Cheapskates one. I hope you enjoy it.
1 1/2 cups of full cream powdered milk
dash of vanilla extract
4 tablespoons of sugar ( optional if you don't want it sweet )
As you boil the kettle, put tap water into the Easiyo container up to the 500 ml mark ( the one you make the yoghurt in, not the thermos part )
Add milk powder, natural yoghurt, sugar and extract.
Blend with a hand blender
Top up the container to the 1 litre mark with tap water
Put lid on and hand shake
Fill Easiyo thermos to the top of the red insert with boiled water
Put the yoghurt container in and put thermos lid on
Leave on the bench for 10 - 12 hours
Take container out and put in fridge.