The UK government is an active supporter of the international protection of important heritage sites, recently announcing the creation of a cultural protection fund and its intention toratify the Hague Convention.
This is something that unfortunately, the United States is not in a position to do because we have yet toratify that convention and it's one of the reasons why we are interested and supportive of having that treaty be ratified by the U.S. Senate.
There is one less simple explanation: a reported disagreement within Israel's defence establishment over whether or not toratify the new international convention against chemical weapons.