Are you sick? No you're not. Not if you take whatever magical mystery powder that makes up Lemsip. I don't know why it works, or why you can't buy it anywhere that isn't a commonwealth country, but I hoard it like there's no tomorrow. Fill my suitcases with it. Amazing. (You genuinely forget you're sick until it wears off a few hours later, so use it strategically.) (Only Lemsip Max holds this power).
