Sch 1 para 4
A person shall be regarded as having pursued an activity as a manager of an undertaking for the purposes of this Schedule if he has pursued such an activity in an undertaking in the occupational field in question: (a) as a manager of an undertaking or a manager of a branch of an undertaking; or (b) as a deputy to the proprietor or the manager of an undertaking where that post involves responsibility equivalent to that of the proprietor or manager represented; or (c) in a managerial post with duties of a commercial and/or technical nature and with responsibility for one or more departments of the undertaking.