Despite the Labour Government's much-vaunted commitment to open government, thousands of documents are being withheld past the 30-year period.
The files on animals are Medical Research Council documents held at the Public Record Office in Kew, west London, but not open to the public. Other MRC reports are held back.
Two files from 1950 titled Monkey Experimentation, from the minutes of the Research Committee on the Medical and Biological Application of Nuclear Physics, are closed for 50 years. One can speculate that these are held back to spare the feeling of animal lovers over the grim fate of our fellow primates.
The Medical Research Council says that files involving animals or patients' records are held for 50 years.
The suppression of the Ministry of Defence's 1959 report, "The use of outer space", will be grist to the mill of Ufologists and X Files addicts alike. The non-release of a 1972 MoD file on Kenneth Littlejohn will also arouse the interest of conspiracy theorists. Littlejohn was a renegade MI5 agent working against the IRA who died in mysterious circumstances. There have been suspicions that the secret services may have had a role in his death.
These items may verge on the bizarre but many Cabinet minutes and memorandums are still suppressed. Taking 1953 as a random year, 22 Cabinet minutes and 19 Cabinet memorandums for that year are still excised from the record. They will not to be released until 2004 or 2054.
Numerous files on Hong Kong from the MoD and the Foreign Office are "retained by department" with no release date. Why, for instance, is a Cabinet document on "Anglo-French Union", dated October 1956, withheld?
In July 1993, William Waldegrave, the minister then responsible for Cabinet records, launched an initiative to release documents held past the 30-year period. Tens of thousands of documents were given "accelerated release". But concern is rising at the number that continue to be withheld. Some are withheld to protect privacy. These include hundreds of files on the Royal Family. Files that impinge on individual privacy of those still alive are often closed for 75 years.
But, the Government cannot say how many documents it continues to hold back. A spokeswoman from the Cabinet Office said there is "no central tally" of documents that continue to be suppressed.
In recent weeks the Government's commitment to open government has been questioned after the failure to produce a Freedom of Information Bill.
Historians, such as Richard Aldrich, of the University of Nottingham, say the Government concentrates on releasing documents that produce publicity, such as details of the plot to killHitler. "What we have is a few high- profile releases like the recent SOE [Special Operations Executive] documents, while documents that are more important to our understanding of history may take another 10 years to be released."
Brian Brivati, of Kingston University, said that by "cherrypicking" files that attract publicity, "we end up with bits and pieces and it will be a long time before we can write proper history".
According to Mr Aldrich, the biggest problem is the lack of resources given to government departments to release documents. "Britain doesn't value its history. In the United States, government hire the best historians to oversee their declassification programmes. Here they often use low- rank civil servants who have little historical knowledge."
He cited the recent case of a government "weeder" who had obviously spent hours excising the initials "PUSD" from documents. PUSD stands for the Foreign Office's Permanent Under-Secretary's Department and one of its tasks is to keep an eye on MI6.
"The authorities seem quite unaware that the intelligence and security aspects of PUSD were discussed as early as 1956 in Lord Strang's memoirs," Mr Aldrich said.
He pointed to cutbacks in the number of people "weeding" files for release. "Each year the budgets are cut," he said. "The staff are demoralised and worked to the bone. The MoD record office has been moved three or four times in the last three years."
Mr Brivati said: "It is ludicrous that they do not release everything pre-1950, exempting only those files which intrude on individual privacy. This would free up weeders to work on later periods."
Files withheld at the Public Record Office beyond 30 years
n Medical Research Committee. Monkey experiments - Research Committee on the Medical and Biological Applications of Nuclear Physics. Files FD1 495 & 496.
n Medical Research Committee. Stray cats and dogs: guidelines and cases 1941-54. FD1 381.
n Medical Research Committee. Use of ACTH and cortisone. 1951-53. FD1 643.
n Atomic Energy Commission: 1959 accident at Aldermaston 26-2-59 EG1/173.
n Ministry of Agriculture Fisheries and Food: Windscale accident 1957; effects of radioactivity on animals. MAFF 298/54
n War Office: Irish Situation 1914-22, Raid and Search Reports. WO35/86B:
n Air Ministry : Hong Kong: Photographic Reconnaissance 1950-56 : Air 8/2399.
n Air Ministry: Special Operations Executive 1941-51, Air 40/2573.
n Chiefs of Staff: Chemical Warfare Policy - COS (53) 2, Minute 1.
n Prime Minister's Office: De Gaulle 1943. PREM 3 121/4.
n Prime Minister's Office: Soviet Union 1946, PREM 8 342
Colonial Office: Palestine - Jewish Leaders who evaded arrest. 1947 CO 537/1722.
n Cabinet: Anglo-French Union, October 1956, CAB 130/120.
n Ministry of Health: Venereal Disease. Disclosure of Information. Divorce and other legal proceedings.1927-35. MH55/1324.
n Ministry of Health: Hospital workers from Barbados. 1947-52. MH55/1474.Reuse content