registered political partymeans a party which was registered under Part II (registration of political parties) of the Political Parties, Elections and Referendums Act 2000 at the time by which the notice of election is required to be published by virtue of rule 1 (“the relevant time”), and a registered political party is a qualifying party in relation to an electoral area if, at the relevant time, it was registered in respect of England in the Great Britain register maintained under that Part.”
the principal Rulesmeans the Greater London Authority Elections (No. 2) Rules 2000.