Wagtail
Horse servant
Actually you couldn't. This is from the Prudential (sorry, can't cut and paste it so this is a quote):
"The doctrine of insurable interest states, broadly speaking, that in order to have a valid policy of insurance/assurance the policyholder must:
(1) gain a benefit from the continued existence of the item being insured; or
(2) suffer a loss on its destruction
This concept applies to all forms of assurance and insurance, not just life assurance."
It goes on to quote the Life Assurance Act 1774, which says that it is not lawful to make an insurance policy without inserting the name or names of the person(s) interested in the life or event.
I stand corrected.
I have heard of people insuring the lives of famous people though if they are, for example, a lookalike and it is their occupation.
In the case of the OP, then the conditions you quoted would apply, even though they are not the owner.