Among the newly released files was a note warning authorities to be careful to avoid a situation similar to India in 1947, when the local press was filled with reports about the "pall of smoke" over Delhi at the very end of the British Raj as officials burnt documents before leaving.
Under "Operation Legacy", officials in Kenya, Uganda, Malaysia, Tanzania, Jamaica and other former British colonial territories were briefed on how to dispose of documents that "might embarrass Her Majesty's Government".
A Colonial Office telegram of 3 May 1961 stated the general guidance for keeping papers out of the hands of newly elected independent governments.
Items should be disposed of if they "might embarrass members of the police, military forces, public servants or others eg police informers; might compromise sources of intelligence" -- or might be used "unethically" by incoming ministers.
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The documents also include "destruction certificates" sent to London by colonial officials as proof that they were performing their duties, and letters and memoranda that showed that some were struggling to complete their huge task before colonies gained independence.
Officials in more than one colony warned London that they feared they would be "celebrating Independence Day with smoke".
Officials were often granted or refused security clearance on the grounds of ethnicity. Documents marked 'Guard', for instance, could be disclosed to non-British officials as long as if they were from the Old Commonwealth - Australia, New Zealand, South Africa or Canada.
Those classified as 'Watch' and stamped with a red letter W, were to be removed from the country or destroyed. The marking 'DG' was said to be an abbreviation of deputy governor, but in fact was a protective code word to indicate that papers so marked were for sight by "British officers of European descent only".
The files released today are the final batch of a collection whose existence was only revealed by the Foreign Office in January 2011 as part of the Kenyan action.