Thanks all. Yes, in the past I've taken a flask but now considering a stove for hot meals. Will have a look at all the suggestions
I think any recommendation will depend on 'fuel type' you want to use.
Are you wanting a specific fuel, or low weight, or quick 'boil', or low simmer, or low purchase price, or low running cost etc etc.
Gas - in my mind is the best all round. High power, controllable, clean
Solid fuel - (eg Hexamine) dirty and smelly. Low power, not controllable
Alcohol - light weight (except for the 'bottle of fuel') but will make clothes stink if bottle leaks. Reasonable power, not controllable
Wood - Cheap, needs collecting, low power, dirty, not very controllable.
Interesting view on Fuel differences here :
http://bushwalkingnsw.org.au/clubsites/FAQ/FAQ_Efficiency.htm