Article 6 I1

drilling for, or extraction of, oil or natural gas;

extraction (whether by underground or surface working) of minerals and tunnelling or boring, or construction of underground works, for this purpose;

manufacture of building or engineering components or equipment, materials, plant or machinery, or delivery of any of these things to site;

manufacture of components for systems of heating, lighting, air-conditioning, ventilation, power supply, drainage, sanitation, water supply or fire protection, or delivery of any of these things to site;

the professional work of architects or surveyors, or of consultants in building, engineering, interior or exterior decoration or in the laying-out of landscape;

the making, installation and repair of artistic works, being sculptures, murals and other works which are wholly artistic in nature;

signwriting and erecting, installing and repairing signboards and advertisements;

the installation of seating, blinds and shutters;

the installation of security systems, including burglar alarms, closed circuit television and public address systems.