This is a little confusing.

The Obama administration says it may curtail Anglo-American intelligence sharing if the British High Court discloses new details of the treatment of a former Guantanamo detainee.
A court filing from the British Foreign Office released recently includes a letter from the U.S. government, identified as the “Obama administration’s communication.” Other information identifying the U.S. agency and author of the letter appears to have been redacted.
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At issue is whether the British courts will disclose a seven-paragraph summary of the treatment of Binyam Mohamed, a former detainee who was released from Guantanamo Bay prison in February.

How about a compromise? Hand it over to the US Justice Department. It’s not enough to fill four memos but that seems to be the acceptable channel for release of such info.