Where the functions of Scottish Enterprise, or of Highlands and Islands Enterprise, mentioned in section 2(3)(a) or (b) of this Act are carried out through an agent or are delegated to any person, the body in question shall have the duty (which shall not itself be delegated) of keeping under continuous review the suitability and adequacy of any training provided by that agent, or as the case may be by that person (or his agent), in discharging those functions.