Martin asks whether or not a malt loaf actually weights 222g. The answer is that the packet doesn’t seem to say, but that most people aren’t as vile as me and won’t eat an entire malt loaf in one sitting.
Indeed commonly in my family, one maltloaf will be spread among four or five people along with other foodstuffs for a light evening meal. Indeed I assume they expect one to split the loaf into eight slices, hence the nutritional information in eighths.
It’s not meant to be a snackfood certainly.