Lots of people in the open system are very determined to try and strengthen evidence-based policy.

In any system, there will be change happening without you.

What you don't do is just say, "I've got all the ideas and all the knowledge, and listen to me."

The post-Second World War simple system of social democracy and organized labour has fragmented massively, but just because people aren't organized in workplace trade unions doesn't mean they aren't in associations with other people - work-based, place-based, culture-based, sport-based, faith-based - there's a bit of an old rainbow coalition argument.

There's a tendency for people who believe passionately in something to be so convinced of their rightness that if they just repeat themselves a lot at the person, that will convince them. And that hasn't worked on things like immigration or trade deals.

People think there's a single solution to complex problems, and the solution is often making an enemy of a group of people - pulling back and rejecting the other.

I see [activists] getting really angry that people won't just do what the evidence tells them, and that's not very helpful. You need to actually think why that is.