Hannah, remember you'd also be 'sharing' your HE'A with whoever else is having the puds! Therefore, depending on the quantity used in the receipe, it might be better for you to keep your HE'A allowance and just syn the milk for the puds.
I make 10 for 15 syns - all the syns are in the flour as eggs are free and milk is a HEXA. 84g (3oz) plain flour made 10 small puddings which can be frozen for use later. So 1.5 syns each compared to Aunt Bessies 2 syns each.
Amazingly, the pudding tins worked really well with a squirt or two of spraylight - so no oil necessary