"The Commission has concluded that the party’s spending return was incomplete, as it was missing 74 payments totalling £123,748, along with 33 separate invoices totalling £34,392. The registered treasurer of the party committed two offences in delivering this incomplete return, and the party has been fined £20,000," the Commission said in a statement.
The Electoral Commission's investigation into the party's election campaign spending return was opened on January 22 after allegations had been made to the body regulating party and election finance that the return may have been incomplete.
In May 2015, the UK Conservative Party won the general election by securing 331 seats in the parliament, prompting Miliband to stand down as leader of the Labour Party.
