Good morning, early birds. The Yes and No campaigns for marriage equality kick off in earnest as postal surveys are sent out, there has been a terror attack in London, and we'll find out if CBS can buy Channel Ten after all. It's the news you need to know, by Max Chalmers.

MARRIAGE CAMPAIGNS KICK OFF

The Yes and No campaigns were launched over the weekend, as mental health groups warned the government's costly postal survey was behind a spike in demand for their services.