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The cat broke wind and caused the explosion, so it should be on the pet insurance, not the household. (We have a special deal on combined pet and contents insurance BTW)

Fair enough. I was thinking mostly of third party risk to be honest. I cannot see how a scuba tank would change contents but that is insurance companies for you. Knobs. The leaseholder could have...

What sort of insurance? What are the terms of the lease? What insurance are you required to have?

I cannot see any difference between having medical O2 and diving O2 other than volume. A deco can of O2 is no different to a medical cylinder. Irrespective of whether a person needs it to breathe...