814.This paragraph permits regulations to be made defining circumstances in which accidental errors in decisions may be corrected, and provides for setting aside decisions in specified cases where there is procedural irregularity.
Sub-paragraph (1)(a) provides for regulations to be made for the correction of accidental errors in a decision or record of decision given by the local authority, an appeal tribunal or a Commissioner.  Thus “slips of the pen” (such as mis-written dates) can be corrected.  Sub-paragraph (1)(b) provides for regulations to be made for the appeal tribunal or Commissioner to set aside a decision and re-hear a case in the interests of justice if a procedural error has occurred in the service or receipt of documents, or if a party to the proceedings was not present at the hearing.
Sub-paragraph (2) provides that any power exercised under this provision shall not derogate from any other power to correct or set aside decisions.
Sub-paragraph (3) defines “relevant provision”.
Part III: Social Security Administration Housing Benefit and Council Tax Benefit Schedule 7 Paragraph 19: Correction of errors and setting aside of decisions