solo run

(idiomatic, Ireland) Action taken without consultation of colleagues or approval of superiors

Example: 2014 (August 23) Jason Byrne, "Dublin ladies through to All Ireland semi final after beating Kerry" Irish Independent:
  Dublin fired a second goal when Noelle Healy ended her fine solo run with an impressive finish.
2014 (September 20) "Varadkar's solo runs show he's the wild card in the Government pack" Enniscorthy Guardian:
  For a start Minister Varadkar, without seeking approval from on high, set off on a solo run informing the public that not everything in the pie-in-the-sky programme for Government was achievable.