Plausible Deniability

"Careful research has been unable to identify any occasion... when we have received a request for permission by the United States for a rendition through the United Kingdom territory or airspace."
- Jack Straw

Shh...

Update
It seems that everyone knew about rendition flights except us ordinary folk (via DK):

The European Union secretly allowed the United States to use transit facilities on European soil to transport "criminals" in 2003, according to a previously unpublished document... EU officials confirmed that a full account was circulated to all member governments, and would have been sent to the Home Office.

Meanwhile, elsewhere:

From a general point of view, the rapporteur underlined that the information gathered to date reinforced the credibility of the allegations concerning the transfer and temporary detention of individuals, without any judicial involvement, in European countries.

Legal proceedings in progress in certain countries seemed to indicate that individuals had been abducted and transferred to other countries without respect for any legal standards. It had to be noted that the allegations had never been formally denied by the United States. The rapporteur takes note of the situation and deplores the fact that no information or explanations had been provided on this point by Ms Rice during her visit to Europe.
- Council of Europe press release on the statement by Dick Marty, rapporteur of the Committee on Legal Affairs and Human Rights

It looks like there's about to be a serious plausible deniability failure here.