If you read the article, this is what I'd call a second-level effect, the shutdown of the pubs in Britain has led to slowdowns in the brewing industry, and Marmite is made from (used) brewer's yeast, which is now in short supply.
Not that I plan to run out and buy any Marmite, but I'm wondering just what they thought it could be used for. But then, I've got some other products in the pantry that some people might wonder what they're used for, too.
The last thing I need is another "hard to find where I live" that I don't want to do without.
I just finished up a jar of some roasted tomatoes in olive oil in a stir-fry. I looked in Kroger today and was startled at the price for a small jar. I do miss shopping the grocery section at T.J. Maxx for this kind of delicacy.
I looked up marmite recipes and there are tons of them. Buzzfeed has 15 alone and they are not even a cooking site. Not all of their links work. Their marmite buttercream (you read that right) points to a list of healthful recipes that does not appear to have the promised frosting.