Prof John L said:Its my age....
I posted a reply for Holoiday22 in the insurance section in here by mistake - sorry for the confusion. I note that Raywood has already responded in the insurance section.
I note Ray's response, outlining the current insurance industry normal response.
If something has become a 'tradition' (such as the site owners not being liable for damage to customers property) that in my view means its ripe to be re evaluated. Any organisation selling storage or security must make their service exceptional in those respects and expect to hammered if they fail.
If they don't provide what they advertise and sell then that is fraud.
John you are correct about the storage owner being responsible for the care of your property as that contract took place the moment the contract was signed. The owner of the flooded caravan can probably claim as the the storage owner was negligent as they did not take any preventive measures. This is under "tort" in common law, however many storage owners have a clause stating thart the caravan shoudl be insured at all times. I am not sure whether that is an "unfair" clause but I doubt it.