John Lawrence moved his council to Simla in 1864.

Reasons for the move:
- The hot and humid climate of Calcutta made it difficult to conduct official business during the summer months.
- Simla, located in the foothills of the Himalayas, offered a cooler and more pleasant climate.
- The British had already established a summer retreat in Simla, and it had become a popular destination for British officials and their families.

Impact of the move:
- The move to Simla helped improve the efficiency of the British administration in India, as officials were able to work more comfortably and productively during the summer months.
- Simla also became a center of political and social life for the British in India, with a thriving social scene and the construction of new buildings and infrastructure.
- However, the move also had negative consequences, as it further separated the British rulers from the Indian people, who were largely excluded from the social and political life of Simla.

Overall, John Lawrence's decision to move his council to Simla was an important event in the history of British rule in India, with far-reaching consequences for the administration and society of colonial India.