someone should boringly point out at this stage that freezing your packs will destroy some of their nutritional value, and should really only be done with a fourth daily pack or as a really occasional treat.
same goes for cooking any of them (except the porridge, which has been designed for it).
a VLCD is healthy, but it's right at the very edge of what is healthy, and partly that's because although your body is coping with all kinds of extreme stuff, it's getting all the nutrients it needs. in normal circumstances your body copes without all those nutrients... but then it's also getting plenty of calories and carbs.