Boris Johnson ended weeks of speculation by declaring he will campaign to leave the European Union in the upcoming referendum.
He said the it had been an "agonisingly difficult" decision, but said he wanted a better deal for the British people.
David Cameron has warned that Britain has "100 days to secure our future", as a poll suggests the final result hangs in the balance.
The EU referendum is a choice between "the devil and the deep blue sea", one of the UK's most senior business leaders is to say today.
Britain's car industry is an economic success story, and with uncertainty over the impact of Brexit, it wants to stay put.