Mountbatten Plan was announced on 3rd June, 1947. Hence, this plan is also known as 3rd June Plan. It recommended for two separate countries, India
The British Prime Minister Clement Attlee announced a declaration On 20th February, 1947, in the British Parliament known as Attlee's Declaration.
According to this Declaration, the British would "Quit India after transferring power into responsible hands not later than 30th June, 1948".
After this declaration, Lord Mountbatten has been sent to India as the Governor General in March, 1947.
Mountbatten announced his Plan on partition of British India. According to this Plan, a Boundary Commission was appointed which was headed by Cyril
Radcliffe. He was asked to draw the boundary between India and Pakistan in one month.
British authority over Princely States will be ceased and they can join either India or Pakistan or can remain independent.
The Constituent Assemblies of both India and Pakistan were free to make their Constitutions separately.
The Governor General was to be vested with sufficient powers until March 1948 for effective implementation of the Indian Independence Act, 1947.
Mountbatten Plan was approved by the British Parliament as Indian Independence Act, 1947 on 18th July, 1947.