(1)In this Part references, in relation to any aggregate, to its originating site are references (subject to subsection (2) below)—
(a)in the case of aggregate which has been won from the seabed of any area of sea in the United Kingdom or United Kingdom waters and is not rock, to the site where it is first landed after being so won;
(b)in the case of aggregate which results from the application of an exempt process to any aggregate and is not rock, to the site where that process was so applied;
(c)in the case of rock, to the site at which it is first subjected to an industrial crushing process; and
(d)in any other case, to the site from which the aggregate was won or, as the case may be, from which it was most recently won.
(2)Where any aggregate which is on its originating site on the commencement date has been mixed before that date with aggregate the originating site of which would (but for this subsection) be different, the site where the mixture is situated on that date shall be deemed for the purposes of this Part to be the originating site of all the aggregate comprised in the mixture.