This is the BBC.

Welcome to the briefing room with me, David Aronovich.

This week we're asking why the election that Labour lost, its third in a row,

was also the election that Corbyn won.

This was supposed to be the election that wiped out the Labour Party.

If he's there as leader, we will lose scores of seats. We'll be wiped out.

Instead, they increased their share of the vote by nearly 10%. The Conservatives are in crisis, and Labour isn't,

and the prospect of Jeremy Corbyn as Prime Minister

is now being seriously contemplated by people

who described him as unelectable just eight weeks ago.

They just imagined everything was going to be all over by June the 8th.

Well, I'll tell you what, they underestimated us, didn't they?

Underestimated for sure and entitled to smile.

But winners, they weren't.

Labor fell 64 seats short of an overall majority

and the Tories got the most votes and seats.

Step inside the briefing room and find out from political experts what contributed to the

surprise Labour result and whether we should view it as a success or a failure.

In a few minutes, I'll be speaking to two of Britain's leading political analysts

to understand how various factors played out in the campaign.

But first, a little history.

I want to know how this Labour campaign ranks alongside others.

...