Yes you do - so you would be using both your A and B for breakfast - suppose you could use water - but thats disgusting.
Lots of other people on the forum have been eating "magic porridge."
Mix 28g of porridge oats and a muller light yogurt overnight in the fridge - have it with fruit in the morning - its gorgeous - also means you dont have to use your A choice either!
Only the plain one can be used as a HEB though. I've tried the magic porridge as well and thought it wa foul but I seem to be in the minority, so definitely try that as an alternative
If you are on EE you can have 300ml skimmed milk as your HA - leaves enough to make the porridge with half your HA to make it adn the rest you can use for your tea- I pour my allowance of milk in a jug and then I know what I've got left - oat so simple with some blueberries - yum yum
I make mine with water - less than the packet says so its really dry when cooked and then I add milk - it tastes like its made with milk but uses much less leaving plenty for cups of tea