India Office Records
The India Office Records are held in the Asia, Pacific & Africa Collection (APAC) at the British Library. They are the documentary archives of the administration in London of the pre-1947 government of India and are made up from the archives of the East India Company (1600-1858), the Board of Commissioners for the Affairs of India (1784-1858), the India Office (1858-1947), the Burma Office (1937-1948) and many other related British overseas agencies.
The National Archives search facility 'Access to Archives' can be used to search the India Office catalogue. The link below goes directly to this search.