I'm concerned that this may have been done before, but can't find the precise advice on OM. 

I'm looking for a lightweight, preferably low profile, gas trekking stove that will at least work with a range of self-sealing cartridges including camping gaz as I will have to source the canisters outside the UK (eg in the Pyrenees).  Better still if it would also work with the pierce cartridges which are widely available.  Use: heating water for freeze dried food packs and coffee bags below 3000m.  Is the MSR Superfly the main choice?

Trail mag has just done a review this month, but often their stuff omits, for me, some crucial info, like how easy it is to obtain cartridges, and the total time a cartridge lasts on a particular stove.

Thanks

As far as I know, the MSR Superfly is the only stove that will take both regular screw-on and Camping Gaz CV270 resealable cartridges "as is".

Your other option is a stove for a standard screw-on cartridge, with adapters for other types of cartridge.

£18 for pierce cartridges

£10 for CV270 cartridges

Note that the Superfly won't work with the piercable cartridge adapter.