How thick?
Thicker than thin, normal yoghurt. Greek yoghurt (at least over here) is thick and creamy.
Perfect for yucky pudding.. Yum!
Is this another dish you have invented for cooking in a BP mug in the microwave?
Did you try the recipe?
p.s. SWMBO has just informed me that normal yoghurt is used for Yucky pudding - no cooking required.
Whip up some double cream. Fold an equal amount of Plain or flavoured (not lumpy) yoghurt into the whipped cream. Pour or forklift the mixture into a flan dish - eat the excess. Then sprinkle liberally Demerara sugar (do not use brown sugar) over the surface until you cannot see the mix underneath. Place in a fridge for several hours. The sugar forms a solid crust and is perfect left overnight (I have managed this only once).
then take the pudding into a secluded spot away from anyone else and enjoy.