Nigel, correct me if I'm wrong but I have a little collection of working and regularly used army cookers.

As far as I can see, cooker No.2 seems to have been made unchanged through WWII and well into the post war period, I have looked at dozens around the shows as they are so common. I even found one guy with a table of unused spares including boxed tank/burner assemblies.

I have never ever found a date on these though and so can we assume they were made unchanged? If so I will readily dimension my No.2 if it helps.

As a matter of interest this is my performance measurement of the single burner cookers to boiling using 1 litre of water at the same start temp and cold alloy kettle each time. The furriners have to realise the severe importance of hot tea here.

Domestic gas, 65mm ø burner 7mins

Cooker No.2 5mins

Cooker No.2 modified 6min 30secs (if you can stand the wait to get the damn thing to vapourise and burn cleanly)

Cooker No.13 (multi-fuel) 8min 30secs (Petrol) or 6 min 32 secs (Diesel)
Not tested on AVGAS, AVTUR or AVJET. AVPIN strictly not recommended if you want to live and similarly C-Stoff and T-Stoff is not advisable.

R.