Greetings Vic,
The only French gas bottle that I have found that is in any way compatable with an UK bottle is the french 13kgs propane bottle that has the same left hand thread found on a UK small (almost round) CalorButane bottle.
Thats alright if you can;
1, Put it in your locker. It weighs 27kgs full and could have noseweight implications and
2, have a fixed regulator (post 2005 van) with a butane pigtail (without clip on extension.)
Other than that you will need a french reg to go onto the french bottle.
The availability of french bottles is another matter. At almost every fuel garage in France they sell gas. Most of them are national chains ie Elf Primagas and you should not have any difficulty in swopping, especially at the large supermarket chains who seem to stock every brand.
Hope this helps
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