Why do some big successful brands go bust?

Toast is back for a new series, taking a look at the decisions that often left investors burnt.

I'm Sean Farrington, a BBC business journalist. I'll be hearing about the hype.

They're going to do the deal that makes them the most money at that point of time.

And I'm picking what went wrong, talking to owners and employees to ask, what can we learn?

It was being undercut by similar rivals.

It just couldn't survive.

Toast. Listen first on BBC Sounds.

BBC Sounds, music, Radio, podcasts.

Hi, I'm Christy Young, and this is Young again, my podcast for BBC Radio 4,

where I get the chance to meet some of the world's most noteworthy and intriguing people,

and ask them the question, if you knew then what you know now, what would you tell yourself?

Say what's on your mind to be honest.

It's all right. Just say it.

I was so certain that this man loved me, this charming, charming, lovely man.

I'm asking my guests to take an honest look back at themselves.

I don't regret anything in my life.

You don't?

No, no way.

The podcast is young again.

You know, that idea of our relationship with our younger selves.

Oh, if you can only turn back.

...