29 The first defendant has annexed to his affidavit sworn 29 November 2010 an estimated bill of costs which demonstrates that the first to fourth defendants' costs after a 10 day trial will be approximately $100,000. At the hearing of the interlocutory injunction proceedings on 8 November 2010 it was agreed by counsel for all parties that the duration of the trial would be in the order of 10 days. The cost estimate by the first to fourth defendants is entirely reasonable for a trial of that length. However, for the reasons I have given, the amount of security should be an amount to cover the defendants against the particular costs arising from the joinder of Jaddcal in the action, not the general costs of the action. The basic rule regarding the appropriate quantum of security is that the court should fix an amount it considers will be adequate. The court must have regard to the probable costs which the defendants may be put to so far as it can be ascertained, by reason of the joinder of Jaddcal. I consider that an amount of $12,500 for each set of defendants is adequate. Jaddcal should provide security to the first to fourth defendants and to the fifth to tenth defendants in the sum of $12,500 each. The action should be stayed until security is given. The parties should confer in relation to the form of security to be given.