In reply to alexgoodey:
The 'Penny stove' is very sensitive to construction, and I've not found it easy to prime. And I'm not the only one. I'm sure that, built 'correctly', it does work as claimed, but you can follow the instructions, apparently to the letter, and yet not produce a stove that works well.
The simple, open-cup, annular vapour-chamber, jet ring (aka 'Trangia style') burner is pretty straightforward. There are even easier burners, too, such as the zen mini chimney stove. Or even a simple, open cup...
The only real issue with such burners is stepping on them... Reliability isn't really a problem; if the two halves come apart, you've still got the lower cup, and it will burn just about as well...
Some of the commercial products that use the same idea are expensive, and less efficient (e.g. the Vargo Triad, or the Evernew; both pretty thirsty compared to drinks can stoves). And, if you're going lightweight, you don't want a thirsty stove...
Nido: yes, being full fat dried milk, it goes rancid if not used within a few months.