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.

Activists can get very preachy about things. It's more about understanding people's own experiences and tapping into them.

When you get talking to people in positions of power, you find that often their worldview is framed either in terms of their disciplinary studies at university and/or the country where they first got interest in development.

If you were disabled in Russia, you had to re-register every year, and it took up to six months to re-register, so people who lost limbs in Afghanistan had to prove that their leg hadn't grown back.

The magic formula is there is no magic formula.

In the end, that's a blind alley - we have to get back to being able to think on our feet and react.

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.