Rob

If it looks like dog chews and smells like dog chews ... it's dog chews!

But the Iceland stuff is the closest I've ever found to the real thing, while admittedly still sadly lacking compared to the real stuff. The way you cook it is important though. The best way I found was put a lump of the meat, because it is a lump when frozen, on a plate with a couple of sheets of kitchen roll under to mop up the excess grease. Microwave for about 1 minute, just to loosen the frozen lump, and then manually separate the pieces and spread them out so as to not be touvhing other pieces. This ensures no cold spots on the finished product and more even cooking. Then microwave again for about 30 seconds, depending on the microwave. You're just aiming to heat it to an acceptable temperature to eat so keep an eye on it on the second go. It's really easy to overdo it and it becomes tough. Done this way as far as I can tell it's virually identical to the real thing in texture. Frying pan method etc. doesn't work half as well and ruins the final texture.

"What fraction" remains unanswered, Santa ...

I refer you to livo's post. I thought given your recent woes though that you'd be a bit more receptive to the perils of the junk in your food. The problem is that these additives are long-acting so the results are usually only felt many years after indulging. Bit late for you but in general it's best either not to eat them, I know, easier said than done, or at least attempt to moderate your intake.

Re the Knorr stockpots, I've had the chicken ones and find them too salty and way too expensive for what they are. The Kallo cubes are less salty and I suspect is why they do not score better with you. Haven't tried the lamb stockpots but will in due course (if I can see them on a deal).

I don’t want anything too strongly spiced, just a chicken gravy with a hint of spice to complement the chicken and potatoes.

But isn't that just describing standard chicken stock with (let's say) garam masala aromatics? Probably make an akhni stock like livo suggests so you have control over how much to add and so adjust to taste.

Looks pretty good to me ...

If by "good" you mean it's loaded with ultra-processed junk then , yes, it's "good".

It's £3 something a packet (1 g).

So £3000 per kg then! Still, it's twenty times cheaper than gold, weight for weight. Bargain!