You're listening to the inquiry with me Maria Margaronis. An audience waits patiently in front of an empty stage at a conference centre in

Birmingham, the UK's second biggest city.

It's just over a fortnight since the Brexit referendum, campaigned for Britain to remain.

Within hours of the result, he said it would be for his successor to take the country out of the EU.

And on that stage in Birmingham, two days before she took over as Prime Minister,

that's exactly what Theresa May promised she would do.

I couldn't be clearer.

Brexit means Brexit and we're going to make a success of it.

There will be no attempts to remain inside the EU.

She sounds pretty unequivocal, but leaving the EU is a complex and untried process.

Nobody knows exactly what the outcome will look like.

There are some who say it might never happen, including US Secretary of State John Kerry and

former British Prime Minister Tony Blair. So this week after the referendum and the

dramatic upheavals it's caused in Britain's political landscape, we're asking,

is Brexit inevitable? Part 1, Crossroads.

I am Professor Catherine Barnard and I am Professor of European Union Law at the University of Cambridge. An endangered species then?

That's what my employer is asking as well.

For now, we're going to put Professor Barnard to work explaining the legal process for leaving the EU.

Bear with us, it might sound complicated.

But before we get to the juicy politics, we need to get the basic facts straight.

First, what does British law say?

Some people have argued that the referendum isn't legally binding and could be disregarded.

...