Thanks for the info Dave - looks like I'll have to break out my semi-retired Whisperlite...again! It's certainly a failsafe even if it's not exactly lite!
As you say, in late May there is still likely to be plenty of snow which will hopefully concentrate our target species at lower altitudes. And, yes, talking of target species, Snowcocks (Caspian and Caucasian) will hopefully be on the menu...well, not literally - the stove will just be for boiling and rehydrating - I'm a birder after all, not Ryan Jordan!
Many thanks once again, David Caudwell