Great perspective from both you & your dad. My dad's second wife was born in Palestine, but the only recollection I could ever get from her was that she & her peers didn't like the British policemen & teased them for wearing kilts.
The ME is so paradoxical. British policies garner, & deserve, much criticism. But during a period when Great Britain was the only power actively fighting Nazi Germany some Jewish activists were fighting the British, in short, fighting for the Nazis. Two-time PM Yitzhak Shamir was among those. Of course, many more fought along-side the British.
Interesting point about appeasing the Saudis by restricting immigration. What was the kingdom's official position on pre-war Palestine & Jewish immigration?