The European Parliamentary Elections Regulations 2004

[F117.  At the end of paragraph (2) of rule 45 (tendered ballot papers: general provisions) insert—E+W+S

The same list may be used for each relevant election or referendum and, where it is so used, an entry in that list shall be taken to mean that tendered ballot papers were marked in respect of each election or referendum, unless the list identifies the election or referendum at which a tendered ballot paper was marked.]