That would depend on the individual letters patent of the board. The user groups are defined in the letters patent for each individual CPA.
Six of 17 of the CPAs already do consult labour groups in the context. For six of the 17 CPAs, labour groups are included as part of their user group. In each individual CPA, the user groups may be defined slightly differently, but in this case, if you have, for example, six individuals nominated to the board, there would still be six user groups, only one of those user groups must be a labour group.