The Home Office rejected his plea, saying it would be illegal and would wreck the reputation of the IPCC.
However, the OBR rejected his plea, saying it did not have the statutory power to distinguish between the spending plans of individual coalition parties.
US Attorney General Eric Holder welcomed the guilty plea, saying it showed the courts were "one of the most effective tools we have to fight terrorism".
He applauded the reports of the plea agreement, saying "it should allow the laboratory to put this difficult chapter behind us and move on".
Given the details in the plea agreement, he said, "it's reasonable to believe that he was here to launch a second strike, and that we were right to bust him rather than wait and see what more evidence would turn up".
Mark A. Godsey, the assistant United States attorney prosecuting the case, declined to discuss the plea agreement, saying it spoke for itself.
Ms. Eunick-Paul, who signed off on the new plea arrangement, said it bothered her that Lionel's supporters, including his mother, continue to maintain that Tiffany's death was an accident.
Prime Minister David Cameron welcomed the guilty plea but said it was "completely unacceptable for a serving police officer to falsify an account of any incident".
Asked why he did not fine the Yankees' principal owner, George Steinbrenner, for tampering after Steinbrenner made a public plea for Randy Johnson, Selig said: "It wasn't tampering.
This week, Sara Jane Olson, another former radical, pleaded guilty in California to two felony counts in connection with a 1975 bombing attempt by the Symbionese Liberation Army, but then renounced her plea, saying she had entered it only because she felt she could not get a fair hearing given the current pro-government sentiment.
