OPINION: I already have a vaccine certificate stuck inside my passport. A couple of years ago, I was going to Uganda with the Marie Stopes organisation to report on its outreach work. To enter Uganda, I needed proof that I'd had a yellow fever vaccine. I had it years ago, but of course I'd lost the paperwork, so I had to go and get another jab to get the certificate. Fair enough, this is a horrible disease spread by mosquitoes. I felt no infringement of my personal liberty to be asked to do this. Will I feel as happy about being asked to prove I have been immunised against Covid-19? Well actually, to my surprise, yes I will. My surprise is because, in the past, I have been someone who has vigorously opposed ID cards - and campaigned against them.