In the United Kingdom

United Kingdom

The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 a Special Advocate is a lawyer

Lawyer

A lawyer, according to Black's Law Dictionary, is "a person learned in the law; as an attorney, counsel or solicitor; a person who is practicing law." Law is the system of rules of conduct established by the sovereign government of a society to correct wrongs, maintain the stability of political...

 usually a barrister

Barrister

A barrister is a member of one of the two classes of lawyer found in many common law jurisdictions with split legal professions. Barristers specialise in courtroom advocacy, drafting legal pleadings and giving expert legal opinions...

 or advocate

Advocate

An advocate is a term for a professional lawyer used in several different legal systems. These include Scotland, South Africa, India, Scandinavian jurisdictions, Israel, and the British Crown dependencies of Jersey, Guernsey and the Isle of Man...

, sometimes a solicitor

Solicitor

Solicitors are lawyers who traditionally deal with any legal matter including conducting proceedings in courts. In the United Kingdom, a few Australian states and the Republic of Ireland, the legal profession is split between solicitors and barristers , and a lawyer will usually only hold one title...

, who has special rights of audience

Rights of audience

In common law, a right of audience is generally a right of a lawyer to appear and conduct proceedings in court on behalf of their client. In English law, there is a fundamental distinction between barristers, who have a right of audience, and solicitors, who traditionally do not ; there is no such...

 in accessing evidence

Evidence

Evidence in its broadest sense includes everything that is used to determine or demonstrate the truth of an assertion. Giving or procuring evidence is the process of using those things that are either presumed to be true, or were themselves proven via evidence, to demonstrate an assertion's truth...

 that is otherwise restricted due to national security

National security

National security is the requirement to maintain the survival of the state through the use of economic, diplomacy, power projection and political power. The concept developed mostly in the United States of America after World War II...

 concerns. They have been authorised either by statute

Statute

A statute is a formal written enactment of a legislative authority that governs a state, city, or county. Typically, statutes command or prohibit something, or declare policy. The word is often used to distinguish law made by legislative bodies from case law, decided by courts, and regulations...

 or by precedent

Precedent

In common law legal systems, a precedent or authority is a principle or rule established in a legal case that a court or other judicial body may apply when deciding subsequent cases with similar issues or facts...

 to appear before the Special Immigration Appeals Commission

Special Immigration Appeals Commission

The Special Immigration Appeals Commission is a superior court of record in the United Kingdom established by the Special Immigration Appeals Commission Act 1997 that deals with appeals from persons deported by the Home Secretary under various statutory powers, and usually related to matters of...

, Proscribed Organisations Appeal Commission, Employment Tribunal

Employment tribunal

Employment Tribunals are tribunal non-departmental public bodies in England and Wales and Scotland which have statutory jurisdiction to hear many kinds of disputes between employers and employees. The most common disputes are concerned with unfair dismissal, redundancy payments and employment...

, Northern Ireland Sentences Review Commission, Northern Ireland Life Sentences Review Commission or special security tribunal (as defined by Sections 90 to 92 of the Northern Ireland Act 1998

Northern Ireland Act 1998

The Northern Ireland Act 1998 is an Act of the Parliament of the United Kingdom which established a devolved legislature for Northern Ireland, the Northern Ireland Assembly, after decades of direct rule from Westminster....

.