If your 'something portable' is covered on the house insurance, they have to cover it outside as well if it is reasonable to expect it to be used outside (one insurance company lost a case when they tried to avoid paying out for a ghetto blaster) However, do check the insurance limits and T&conditions - we are with RAC insurance and they cover the DSLR body and lenses as separate items (even if the lens is attached to the body at the time) but other companies are more restrictive.I'm interested in insuring something portable and valuable that gets carried out of the house as well. Would an addition to the house contents not be the simple and cheapest answer, for cameras too?.