You have more choice of flavours and the price is less when you buy plain instant noodles and flavour sachets separately.
You can get 5 sachets, that is 5 meals, and mix it with plain instant noodles nests. You can add real vegetables and small pastries and still get change from £1 for each meal. You would want to steam the vegetables separately in the microwave or in an clay pot in the oven though.
I wonder if it would work with pasta? Can you cook pasta with dehydrated soup?