What is the test for having counsel in a personal injury case?

" 'The court, however, should not permit a litigant both to have counsel and to actively participate in the conduct of the case ... unless the court on a substantial showing determines that in the circumstances of the case the cause of justice will thereby be served and that the orderly and expeditious conduct of the court's business will not thereby be substantially hindered or delayed.' (People v. Mattson, supra, 51 Cal.2d at p. 797 [336 P.2d 937], italics added.)" (161 Cal.App.3d at pp. 801-802, 207 Cal.Rptr. 846; fn. omitted.)

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