““electoral register” means a register of parliamentary electors maintained in accordance with section 9(1)(a) of the Representation of the People Act 19833;”;

““relevant register” means the version of an electoral register published (in accordance with section 13 of the Representation of the People Act 19834) most recently before 1st February preceding the beginning of the year in question;”;

““UK electorate”, in relation to the year ending on 31st March 2018 and any later year, means such number published by the Commission not later than 7th March preceding the beginning of the year in question as is calculated by the Commission to be equal to the total number of persons whose names appeared on a relevant register in England, Northern Ireland, Scotland or Wales;”.