Britain created Israel. Why would they want the country destroyed right after they created it?
That makes no sense.
Getting a response in before this thread gets locked.
While it's true Britain had created the seeds for the state of Israel as far back as 1917 (though it helped Israeli entrepreneurs bargain with the Ottoman sultan to buy lands in Palestine in exchange for reduction of debt as far back as the turn of the century), by 1948 the situation had changed. Initially, Israel was to be created as a British "client state", a factor of instability in the Middle East that would basically require the British Empire to have an excuse to play peacekeeper for the long term. While there were those who helped create Israel out of religious belief, the Empire worked as always on a purely pragmatic concept, thus creating Israel would be another loyal British client state, or loyal Empire subject for years if not decades to come.
It took a careful balancing act; while the Israelis needed to be armed to defend themselves, and were used as a police force against the native Arabs, the British government had to limit immigration to prevent the Arabs from going up in arms all at once, earning the distrust of the Israeli settlers. Not to mention it was clear Britain had no intention of leaving soon, meaning the Israelis who wanted self-rule found themselves stymied.
By 1948, the balance had completely changed. Britain's efforts in WW1 and WW2 had left its treasury empty and unable to support its aging empire, was up against the clock, and everyone knew it. The Israelis, morally bolstered by the revelation of the Holocaust, rose up and demanded independence, and the more militant groups began assassinating British officers and soldiers. The British could not retaliate for fear of being compared to Nazi Germany, and the Israeli radicals grew bolder. Furthermore, with Britain forced to abandon its empire, it was heavily dependent on Arab and Muslim good will for its oil, so it shifted to that direction and grew displeased with Israel, the very state it created.
Overall, the British saw the Israelis as ingrates who wanted out when it suited them after all the Empire did to give them a new home. And the Israelis saw Britain as opportunists who wanted to keep Israel forever under their thumb.