You mention a "civvi Trangia burner" but I thought both the army and civvi burners were exactly the same. In fact the only thing they have in common...I may be mistaken.
I heard that generally stainless steel is a poor heat conductor. Aluminium is a good one. Carbon steel is a good one too.
I am not too sure if my Swedish army cookset is made of carbon or stainless steel.
Nige7whit are you sure what you have is stainless steel? Could it be carbon steel?
My cookset is a WW2 issue I think. It would seem in those days stainless steel was uncommon. It has invaded (civilian) kitchens rather recently.
In my own kitchen | have noticed that all my stainless steel pots get the food to stick/burn. By the way, good idea Nige7whit to test camping cooksets at home first. If they fail outdoors you don't always have the luxury of a Plan B...
With the steel Swedish army pot my experience of it is only with boiled food so far. I have more experience with the alumium version and it doesn't seem to particularly get things to stick or burn.
I think we're on the same wavelength regarding the heat conduction of stainless v aluminum. I got the stainless trangia, because of the fact that it would likely be tougher, and the stainless not tainting food as much, if it's an issue at all.
I am pretty confident it it stainless, it would have rusted by now, if carbon steel.
Regarding the burners, the military trangia burner is significantly bigger than the one that comes with the Trangia 27 etc. The base that holds the meths is bigger, holds more meths, the flange diameter is larger, and I think it's a little taller too. The mouth of the burner is a little large for the civvy trangia simmer ring to sit on without a balancing act.
For my purposes, I prefer the civvy trangia burner in the military cookset, as it allows me to get more accessories inside the pot with the lid on, I have:
the issue meths flask,
swedish firesteel,
small bottle of olive oil,
small bottle of washing up liquid,
small bottle of soy sauce (for noodles),
plastik spork,
piece of scotchbrite scourer,
Trangia pot grip
civvy trangia burner with simmer ring
I might try an experiment sometime.... I have been thinking about getting a piece of metal to place under the base of the large pot, to spread the heat better (like a really thick bottom saucepan, but a seperate piece). I have access to several metals, so it could be stainless, alloy, maybe copper, or even Titanium. I could cut it to a size that it would even pack away into the cookset for storage.