Hissy fit over leaks

The Times says that Britain faces a "humiliating" withdrawal from Iraq, in that it will have to share its "status of forces" agreement with five other countries. I'm not sure it's a humiliation but, it's a good story, which quotes - on the record - Iraq's national security adviser and its industry minister. However:

A British government spokeswoman declined to comment on “leaked” information.

In what sense is this "leaked"? The government's desire to control information is such that if another party to a bilateral (or bigger) international agreement discusses it in public, it throws a hissy fit.