...snip
Finland, Hungary, Iceland, Italy, Norway, Poland, Portugal, Romania, Spain and Sweden have already opened investigations into the clandestine stop-offs.
Flight records show that at least 210 private jets carrying detainees apparently leased by shell companies attached to the CIA have stopped over in the UK since September 2001.
Liberty said that the practice was in breach of British and international law, and European and United Nations human rights conventions, which forbid complicity in torture.
...
The airports where the flights are alleged to have landed include Biggin Hill in Kent, Birmingham, Bournemouth, RAF Brize Norton in Oxfordshire, Farnborough, Gatwick, Heathrow, Luton, Mildenhall in Suffolk, RAF Northolt in north London, Stansted and Prestwick.
..snip
http://www.timesonline.co.uk/article/0,,13509-1897755,00.html