Newly published documents show Lord Mandelson and ministers' concerns about the prime minister and Labour MPs.
A second batch of files relating to Lord Mandelson's appointment as US ambassador has been released.
The 1,000 pages include criticisms of Labour MPs, No 10 and the prime minister.
A government spokesperson said the documents "will be among the largest publications ever laid in Parliament".
Viewers were frustrated when they saw Lord Mandelson in the documentary.
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Newly published documents show Lord Mandelson and ministers' concerns about the prime minister and Labour MPs.