Who was Britain prime minister in 1763?

The Earl of Bute was succeeded by George Granville as British Prime Minister in 1763.
There were two Prime Ministers of Great Britain in 1763.

John Stuart, the third Earl of Bute was Prime Minister from 26 May 1962 to 8 April 1763 and George Grenville was PM from 17 April 1763 until 10 July 1765.