This is the BBC.

Hello and welcome back to Political Thinking.

We've been off for a few weeks, but we are going to stay with this podcast,

which if you've heard it before, you'll know, but if you haven't, you won't.

The idea is to hear some conversations about politics,

to hear my reflections, to hear those of my guests,

in a way that you might not hear anywhere else.

This week is an example of that.

John Lansman is a man you don't often hear from.

He's the guy who founded Momentum,

the campaign group that helped Jeremy Corbyn,

to get control of the Labour Party,

and now is helping him to keep it.

If we want to shift power and wealth to the many from the few,

then we are going to come up against the few.

I think we have to be prepared.

More from John Lansman coming up.

One of the big things that's been on my mind this week

is how to deal with this new world in which we're dealing,

not just with big political parties,

not just with one or two big broadcasters,

but with the huge range of voices that we get in politics,

...