Neil Ferguson is just the figure head of sage. It’s fifty scientists. I don’t know why people keep saying this guy did x y or z. This guy didn’t. He is simply the spokesperson for a group of fifty scientists who work to create the advice. He is not a single contributor.
He apparantly had it so was immune, which indicates immunity is a thing and they know it. If there was any doubt, I don’t think this would have happened. I also suspect it means you can’t catch it twice, due to that immunity. He wasn’t seeing himself at risk.
However it is hypocritical. I do understand his reasoning though if he felt he was safe . And it puts her at risk her travelling if she was using public transport. If not, less so.
The key thing though is people have to stop thinking he is sage, he is not. He is just the spokesperson and one of fifty scientists, foot and mouth, swine flu, it was not him, it was sage, the group who developed the guidance together. Him going or not, doesn’t change anything, other than they are now 49 scientists and someone else will need to be the person who presents their findings to the government.