‘Helloooo, helloooo’ – Abu Mohammed’s usual greeting, in Arabic, when he sends a message to my phone. Our exchanges are usually short, catching up on news, but also covering power outages and bombs from Saudi jets. In May: ‘There’s no work here anymore. This is why I want to register my son for adoption in America. Help me to do this.’

Abu Mohammed’s entreaties are a sign of the suffering that has been happening on an almost industrial scale in Yemen since the Saudi-led coalition – heavily supported by the US and UK governments – began bombing in 2015.