It covers the situation where a homeowner wishes to remove items from their house before it is demolished. Under some circumstances this is not permitted because the items belong to the insurer (EQC or insurance company). For instance, an ornate fire surround, hallway arch, or ceiling rose may have sentimental value. However, as they are attached/built-in to the house, they are considered part of the house and belong to the insurer. Note - I am not a lawyer so treat this as an unqualified observation and get professional advice before doing anything.
Once again, if this information is important please refer to the original document and check to see if there have been any updates. If there is something in the house you want check with EQC (or your insurance company if they are handling your case).