Various, Encyclopaedia Britannica, 11th Edition…
“ But where double insurance has been knowingly effected by the insured or any earlier policy has at any time borne the entire risk or a claim has been paid on a policy in respect of its full value, no premium is returnable.The policy issued by the underwriter to the insured makes mention of certain perils against which the insurance is granted, and unless the policy otherwise provides, the underwriter is liable for any loss proximately caused by any of these perils, but is not liable for any loss not proximately caused by a peril insured against. ”
