Number of tiers

93: Subject to the provisions of sections 88 to 92 inclusive of this Constitution, the provisions of the Representation of the People Act shall apply to the franchise, registration of voters, the administration of the electoral system, offences relating to the electoral system, the conduct of elections, and all matters connected therewith. 

Representation of the People Act (amended 2000) - Third Schedule, Election Rules

33(1): When the ballot papers have been counted, compared, and recorded, the returning officer shall proceed to add up the number of votes given to each candidate, and shall forthwith declare to be elected the candidate to whom the majority of votes have been given.