31. What are the provisions on 'ear marking' direct public funding to political parties (how it should be used)?

"74 Public money to be appropriated for funding election programmes and election advertising in relation to general election

(1)  In relation to each general election, the Minister of Justice must give notice to the Electoral Commission of the amount of money appropriated by Parliament for the purpose of enabling parties to fund—

(a)  all of the broadcasting costs incurred in relation to the broadcast of party election programmes; and

(b)  all or part of the broadcasting costs incurred in relation to the broadcast of candidate election programmes; and

(c)  all or part of the production costs, whenever incurred, in relation to—

(i)  party election programmes; and

(ii)  candidate election programmes; and

(d)  all or part of the publishing costs incurred in relation to the publication of election advertisements on the Internet during the election period; and

(e)  all or part of production costs, whenever incurred, in relation to election advertisements published on the Internet—

(i)  during the election period; or

(ii)  before and during the election period."

Section 74, Broadcasting (Election Programmes and Election Advertising) Amendment Act 2017 

Campaign spending is too general an answer. Public funding is provided not for campaigning in general, but rather for "election programmes and election advertising in relation to general election" in particular.