Emmerson,
That does seem about right, I must admit to becoming interested in gases prices when I started to work in the industry a few months ago on a project. Unlike other parts of the gases industry there does seem to be a complete dominance by one supplier - which is good for them! - but not for us the punter. I can't remember the last time I saw someone with an Alto(Shell Gas ) container. I know in France there is more competition and the supermarkets are big retailers of gas. This is more to do with its use a source for heating/ cooking in some more rural homes.
I believe that prices can only rise - which will all be passed on to the punter. On my rather contentious post in the technical section I reckoned to have found a way of releasing myself from this cycle but fitting permanently a refillable tank to our van and that why I can determine which supplier I use and not have to lug a bottle to a from a shop.
Monkeys Husband