law: Arbitration Act 1940
  Section 23
  Statements of Claim and Defence
  (1) Within the period of time agreed upon by
  
  the parties or determined by the arbitral tribunal, the claimant shall state
  
  the facts supporting his claim, the points at issue and the relief or remedy
  
  sought, and the respondent shall state his defense in respect of these
  
  particulars, unless the parties have otherwise agreed as to the required elements
  
  of those statements.
  (2) The parties may submit with their
  
  statements all documents they consider to be relevant or may add a reference to
  
  the documents or other evidence they will submit.
  (3) Unless otherwise agreed by the parties,
  
  either party may amend or supplement his claim or defense during the course of
  
  the arbitral proceedings, unless the arbitral tribunal considers it
  
  inappropriate to allow the amendment or supplement having regard to the delay
  
  in making it.