Churchill had two stints as PM 1940 -45/1951-5. According to this article Lehi wanted to assassinate Churchill whilst he was at war with Hitler rather than assassinate Hitler. I dont know what you can say about such a prospect. All I can say thank gd for the sake of Israel and the human race that it never happened
Protests in southern Syrian city after Druze cleric's death (AP)
from the article: 'MI5 believed Jewish underground wanted to assassinate Churchill'