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Thanks for your comments, I knew somebody on here would be able to help,

one little trick to use to help prevent the powder from clogging is to turn the extinuisher upside down or on its side and give it a good shake on a regular basis. This prevent the powder from settling at the bottom of the unit in a lump, also check the pressure gauge is in the grenn (if one is fitted).

For a small cost the better ones (usually the more expensive ones) can be serviced by reputable companies. In offices etc this usually occurs annually - not a bad idea for your camper, tent, caravn or motorhome, after all it's your investment that you're protecting.

Yes, I do have mine checked aevery year

Beechy

I carry a powder in my car, taken into the tent whilst away, the only other semi option for all is CO2, but cant be used in confined spaces either, and not reccomended for liquid fires

altough co2 is used for anything that burns if you watch any films!!! 

Dry Powder just makes a heck of a mess in a confined space and is an excellent laxative. Not poisonous,otherwise. It's only bicarbonate of soda with a bit of aluminium sulphate added to keep it flowing. Best all round extiguisher there is. Make sure it conforms to Safety Standards. 

CO2 is OK in confined spaces for liquid fires or fires with electricity present. If the fire has been going for some time then the receptacle will be hot so re-ignition can occur. Not poisonous, just excludes the oxygen but you need a lot to do that. No good outsite cos it blows away. Don't use on wheel fires. The cold makes metal contract and splinter.

Water's OK for solid fires, wood,bedding etc. It's dodgy if electricity is present so disconnect from mains.

Best way is to make sure you take all fire prevention actions before you get a fire.