"10. In the event we were satisfied that the County Durham Probation Board ought to be joined as seventh respondent in case number 2503737/03. First, we accepted that there was a potential basis for liability in the event that a Tribunal was to find that the first respondent (who, of course, strongly denies the allegations) had unlawfully discriminated against the applicant. We do not say for one moment that County Durham Probation Board would necessarily have any vicarious liability, but in our judgment there is at least an arguable case to the effect that if a Tribunal finds that the first Respondent has unlawfully discriminated against the applicant she was an agent of the sixth respondent for whose act the sixth respondent may be liable and has thereby aided another person to do an unlawful act within the meaning of section 57 (1) and that the County Durham Probation Board may then be vicariously liable for that act by virtue of section 58 (1)."
"(1) A complaint by any person that another person - (a) has discriminated against him in a way which is unlawful under this Part, or (b) is, by virtue of section 57 or 58, to be treated as having discriminated against him in such a way, may be presented to an employment tribunal."
"(1) Anything done by a person in the course of his employment shall be treated for the purposes of this Act as also done by his employer, whether or not it was done with the employer's knowledge or approval. (2) Anything done by a person as agent for another person with the authority of that other person shall be treated for the purposes of this Act as also done by that other person."