Do you know this radio programme or podcast?

[DelphiniumBlue]

Long shot- do you recognise this radio show/podcast? I was listening to a discussion on Radio 4 today, and they were talking about who might take over from Melvyn Bragg. Someone ( maybe a caller, maybe a presenter) then mentioned another show where they discuss ways of redoing things, a sort how things could be redesigned in an ideal world to work better. I had the impression it was referring to big infrastructure-type projects.
It sounded fascinating, but I cannot remember what it was called. Any ideas?

Melvyn Bragg is standing down from 'In our Time'. You could relisten to this morning's programme on BBC Sounds.

The Failure of the Future?

Was the programme you were listening to Feedback? I don’t know the other programme but you could re-listen to that to find out, if it was that.

Thanks to everyone who replied...I eventually managed to drag the name out of the back of my brain..it was 'Rethink' on R4, and the presenter, Ben Ansell was mentioned as being a possible successor to MB.
I'd never come across the series before but thought it sounded really interesting.

I've heard a couple of Rethink episodes because it's on at a time when I've been travelling- which also means I haven't heard a full episode. But I liked what I heard.