that Gordon Brown's UN appointment shows that Matt Hancock was lying about the reason the UN belatedly realised they didn't want him anywhere near a health/CoViD role.

that there's no "technicality" stopping a sitting MP from being a UN envoy (although perhaps there should be if they're expected to take either job seriously instead of just grifting like most politicians):

Shane Woodhouse💙💙💙🏳️‍🌈No DMs on Twitter