1Historical activity: a historical display, parade, demonstration or re‑enactment.

1 Historical activity: a historical display, parade, demonstration or re‑enactment. 2 Activity ancillary to a historical activity: restoring, maintaining, modifying, servicing, repairing or housing a boiler used, or to be used, for a historical activity. high risk, in relation to the processing of a CSS, means the processing of a CSS that is reasonably likely to result in a risk to the health of a person at the workplace; high risk construction work—see regulation 291; high risk diving work means work— (a) carried out in or under water or any other liquid while breathing compressed gas; and (b) involving 1 or more of the following: (i) construction work; 1 Subparagraph (ii) includes some additional construction‑related activities.