Theresa May pulls the trigger: the process of Britain leaving the EU is under way. There is no turning back, said the PM. The two-year countdown to Brexit has begun. Subscribe for more as the UK enters unchartered territory: bit.ly/LtASif.
Jon Snow is in Westminster getting all the political reaction, while Jackie Long is talking to the people of Hull who voted resoundingly in favour of Brexit.
Meanwhile, Matt Frei is in Brussels where there was plenty of sadness about this divorce, but also some real steeliness. Adding a few veiled threats and some very clear red lines.