A quick update, still looking for information but found a document with some information, think Clive but I cant find the reference, I have now got a No 7 stove and rumour has it that this was developed for the Royal Marines in the artic.
My hope is to get a description which kids at school and adults can read a description of them, I have No 1, 2, 2 modified, 3, 5 gas and petrol, and a No 7.
Also a AFV boiling vessel.
As an extra have a swiss army 2 burner.