Very impressive digging!
A document has also been shown with BoJo's signature approving FVEY surveillance. Another anon confirmed when this anon mentioned it re FISA. May have been released in US declas documents.
Yes, we have a FOIA, introduced by Bliar, who supposedly regretted doing so. BUT we don't have an equivalent of Judicial Watch to enforce it. Very difficult to bring legal issues to light. Court cases need crowd funding and get stopped ultimately by our Supreme Court's corrupt judges paid by EU. Petitions get fobbed off by civil servants, but we're trying!