| ipt-uk.com | Investigatory Powers Tribunal (IPT) |
| cabinetoffice.gov.uk | Cabinet Office - Intelligence and Security Committee |
| wikipedia.org | Wikipedia - MI5 |
| mi5.gov.uk | MI5 The Security Service |
| met.police.uk | Metropolitan Police Service - Special Branch |
| fco.gov.uk | Foreign & Commonwealth Office - Secret Intelligence Service (SIS) |
| official-documents.co.uk | National Intelligence Machinery |
| www.mod.uk | Ministry of Defence, United Kingdom |
| fbi.gov | Federal Bureau of Investigation |
| gc.ca | Canadian Security and Intelligence Service |
| five.org.uk | www.five.org.uk/ |
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