Salmon and Freshwater Fisheries Act 1975

13The number of servants or agents whose names may at any time be entered on a licence shall not exceed twice the number of persons who in the opinion of the water authority are required to work at one time the instrument to which the licence relates or, where the applicant for the licence notifies the authority at the time of the application that he proposes to take part in working the instrument, one less than twice that number.