Before Jom the Infallible starts up, IIRC Great Britain was given Mandate Responsibility for Palestine in 1921 by an International Organisation called the League of Nations. The Mandate had a finite term of 27 years after which time Great Britain ceased to have any responsibility for the mandated territory. In the course of those 27 years Great Britain could only act with the agreement and approval of the League of Nations.

According to my arithmetic 1921 + 27 years brings us to 1948 and if memory serves me correct that is when Great Britain departed and the Jews declared their independence and founded the sovereign state of Israel, immediately recognised by the U.S.S.R., the USA and the United Nations. All of Israel's Arab neighbours immediately went to war with Israel and were comprehensively defeated. Instead of opting for peace the Arabs elected to go to war and have been losing ever since - more fool them.

So you see Jom - washing hands off anything just simply did not enter into it - Great Britain relinquished mandate responsibility exactly when they originally agreed to do precisely that.