The High Court deals at first instance with all high-value and high-importance civil law cases; it also has a supervisory jurisdiction over all subordinate courts and tribunals, with a few statutory exceptions, though there are debates as to whether these exceptions are effective. The High Court consists of three divisions the King Bench Division, the Chancery Division and the Family Division. Their jurisdictions overlap in some cases, and cases started in one division may be transferred by court order to another where appropriate. The differences of procedure and practice between divisions are partly historical derived from the separate courts which were merged into the single High Court by the 19th-century Judicature Acts, but are mainly driven by the usual nature of their work, for example, conflicting evidence of fact is quite commonly given in person in the King Bench Division, but evidence by affidavit is more usual in the Chancery Division which is primarily concerned with points of law. Most High Court proceedings are heard by a single judge, but certain kinds of proceedings, especially in the King's Bench Division, are assigned to a divisional court bench of two or more judges. Exceptionally the court may sit with a jury but in practice normally only in defamation cases or cases against the police. Litigants are normally represented by counsel but may be represented by solicitors qualified to hold a right of audience, or they may act in person. In principle, the High Court is bound by its own previous decisions, but there are conflicting authorities as to what extent this is so. Appeal from the High Court in civil matters normally lies to the Court of Appeal, and thence in cases of importance to the Supreme Court the House of Lords before 2009 in some cases a leapfrog appeal may be made directly to the Supreme Court. In criminal matters, appeals from the King Bench Divisional Court are made directly to the Supreme Court. The High Court is based at the Royal Courts of Justice on the Strand in the City of Westminster, London. It has district registries across England and Wales.