> Breakfast cereals including ready-to-eat cereals, granola, muesli, porridge oats and other oat-based cereals.
until I re-read and saw this:
> But the new restrictions will not apply to healthier options such as natural porridge oats and unsweetened yoghurt.
So I think it's not clear in the first sentence but "ready-to-eat" is meant to apply to all the items in the list and not just the cereals.