When
There is no pre-determined limit.
Gordon Brown
Gordon Brown
Gordon Brown
Oliver Cromwell.
David Cameron is the current leader
Prime Minister.
No, but Harold Wilson was
Winston Churchill
In 1886, Great Britain and Germany divided the islands between them, but sometime later Britain was given full control and leadership of the entire territory. The Japanese invaded the islands at around 1942, but, in 1945, Britain regained control.
Great Britain does not have a leader because it is not a country. The head of state of the United Kingdom is Queen Elizabeth II. The current head of government in the UK is David Cameron.