Hi hun
I have just had a look on the official sw website for you under healthy extras and it does list some branded porridges but not the Oat So Simple ones.
It also states you can have 35g porridge oats (unflavoured) as 1 healthy extra B choice.
If you have the plain sachets and they are no more than 35g then I don't see why you can't have them (maybe someone else may be able to explain).
I also noticed there is a list of new added healthy extras as well as ones which have been removed and it does not mention Oat So Simple.
Here are the porridges which have been removed:
[*]Dorset Cereals Fruity Porridge, Cranberry & Raspberry
[*]Dorset Cereals Simply Porridge
[*]Ready Brek, any variety
I hope this information helps.
Love Stacey xxx