“Our support is not unconditional. We expect such a proud and successful democracy to respect international humanitarian law, even when challenged,” Cameron said, after an Israeli airstrike killed seven aid workers, including three Britons.

Note :

UK support for Israel "not unconditional" does not say anything about the "conditions" - conditions which can possibly facilitate Israeli occupation.

"To respect international humanitarian law" does not necessarily mean to obey or abide by it.