That’s not all. If they’re assisting the CIA then they will hae been assisting an international terrorist organisation (according to British law):

1. The Terrorism Act 2000, Section 1 interprets ‘terrorism’ thus:

“In this Act “terrorism” means the use or threat of action where—
(a) the action falls within subsection (2),
(b) the use or threat is designed to influence the government or to intimidate the public or a section of the public, and
(c) the use or threat is made for the purpose of advancing a political, religious or ideological cause.
(2) Action falls within this subsection if it—
(a) involves serious violence against a person,
(b) involves serious damage to property,
(c) endangers a person’s life, other than that of the person committing the action,
(d) creates a serious risk to the health or safety of the public or a section of the public, or
(e) is designed seriously to interfere with or seriously to disrupt an electronic system.” http://www.opsi.gov.uk/acts/acts2000/ukpga_20000011_en_2#pt1-l1g1

2. The Reinsurance (Acts of Terrorism) Act 1993 section 2(2) provides:
“In this section “acts of terrorism” means acts of persons acting on behalf of, or in connection with, any organisation which carries out activities directed towards the overthrowing or influencing, by force or violence, of Her Majesty’s government in the United Kingdom or any other government de jure or de facto” http://www.opsi.gov.uk/acts/acts1993/pdf/ukpga_19930018_en.pdf

3. The Council of Europe Convention on the Prevention of Terrorism [2005] states: “acts of terrorism have the purpose by their nature or context to seriously intimidate a population or unduly compel a government or an international organisation to perform or abstain from performing any act or seriously destabilise or destroy the fundamental political, constitutional, economic or social structures of a country or an international organisation;” http://conventions.coe.int/Treaty/en/Treaties/Html/196.htm