Today in Media Files, the ABC and The Guardian were refused access to cover Tony Abbott's global warming speech in London, and advertising and editorial priorities collide in the same sex marriage debate.

ABC blocked from covering Abbott's London speech. The ABC and The Guardian were blocked from covering Tony Abbott's speech to the Global Warming Policy Forum in London, while The Australian was given an advance copy to report as an "exclusive" on its front page today. In the now widely-reported speech, Abbott said global warming was "probably doing good, or at least, more good than harm". The ABC's London bureau chief Lisa Millar told Crikey via email this morning that the team in London had been trying for weeks to obtain permission to film and have access to the speech, but they weren't successful. "We have made consistent and dedicated attempts since the speech was announced to get approval to cover it appropriately," she said.