(1) In determining for the purposes of regulation 4(1)(a) where any goods were grown, produced or manufactured, any materials or other things of the following descriptions (wheresoever grown, produced or manufactured) used in their production or manufacture are considered to be grown, produced or manufactured in the Caribbean Community Market area or, as the case may be, the Common Market area, that is to say—
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(a) materials described in Schedule 1 used in the state so described;
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(b) energy, fuel, plant, machinery and tools used as aforesaid in the Caribbean Community Market area or, as the case may be, in the Common Market area, and materials used in the maintenance of such plant.