https://www.techradar.com/news/how-to-watch-australia-grand-prix-online-f1-live-stream

In the UK, coverage of The 2018 Formula One season is once again being split between Channel 4 and Sky Sports. 

Sky Sports F1 has live coverage starting from 3.30am GMT, with the race starting at 5am GMT. Channel 4's highlights are shown later in the day, starting at 2.30pm GMT.