By 1948 the Jews had made Mandatory Palestine too hot to handle & the British withdrew but continued to support Arab states attacking the new Israeli state. The Jews won their war for independence; this didn’t go down well in London.
Firstly, you skip over the fact that the Jews were in fact two terrorist gangs that even the majority of Palestine Jews opposed and actually helped the British hunt down, with the public consent of Ben Gurion.
Secondly, the RAF helped defeat an Arab attack at Ramat David airfield in the 1948 war. So British forces helped Israel at least once, where were US forces?. And before you start mentioning the Arab Legion, the UK govt made it illegal for any British soldier to fight for the Legion, those who did were arrested and imprisoned on return to the UK.