Misc: [pot luck] what is the word perambulator usually shortened to?

Questions

In 1910 William ---------- discoverer of stellar nature of Andromeda, dies?

In 1940 Winston Churchill succeeds ---------- as British PM?

In 1941 England's House of Commons detroyed in a---------- ?

In 1943 ---------- (Leitch) Scotland, rock singer (Mellow Yellow), born?

In 1955 Mark David ---------- assassin of John Lennon, born?