In 2017, Westminster passed the necessary legislation to enable the United Kingdom to implement the Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict of 1954 and the Protocols to that Convention of 1954 and 1999.
Some Subject search terms to use in SOLO
Art treasures in war
General works (which may well include eg chapter on this aspect)
Cultural property -- Protection (International law)
Perhaps also try