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Hi Peter Pedant. Nice to hear from a man in the know. I have concentrators(2) in , the house, and then big tank outside where we refill the portable ones. Having only 2 portables restricts my going out, so I don't stay out too long.I will be able to manage the bottles, as I have hired a mobility scooter for the day.I will turn it off when I am at rest,, and give myself a blast when needed. I am on 4 litres.If I do pop me clogs, it will be in a fab place, as Im off to Farnborough air show:)