At first, I wasn’t sure I was really up for today and thought it would be better to sleep through it. Common Purpose is, just occasionally, really hard work, and two of my kids are in the middle exams and taking it out on me. But this email made it all feel possible.

The idea is “toilet twinning”. You twin your home/office/church/school toilet with a latrine in Africa to help support water sanitation there. In return you get a framed “I’ve twinned my toilet” certificate to hang in your toilet, with its own GPS reference point so that you can find your latrine on Google Earth.

So when you next stop by Common Purpose in London, I hope that you will use our facilities and see our certificate!