Disaster struck the Young family last Friday. My 12-year-old son Charlie woke up with a temperature. Ordinarily, that wouldn’t matter, but we were in the Dolomites and due to fly back to England from Venice later that day. On the flight out, we’d all had our temperature checked with an infrared thermometer pointed at our foreheads, and there was a similar policy in place at Marco Polo airport for our return journey.