The IAA is split into two tiers; Immigration Adjudicators and the Immigration Appeal Tribunal
Immigration Adjudicators consider appeals against decisions made by Immigration Officers, Entry Clearance Officers and the Home Secretary, with permanent centres in Islington in Central London, Hatton Cross, Birmingham, Leeds, Manchester and Glasgow.
The Immigration Appeal Tribunal deals with applications for leave to appeal and appeals against decisions made by the Immigration Adjudicators, the main hearing centre being just off The Strand in Central London.
At hearings, immigrants are represented by legal representatives including barristers, solicitors, and those registered with the Office of the Immigration Service Commissioner. The UK government is represented by Presenting Officers; specially trained Civil Servants.