Thank you; that's a helpful way of looking at it. There's also something about enabling at least a bit of in-person interaction between staff, particularly because we have a lot of really new people and trying to learn a job remotely is hard.

I'm definitely happy for anyone who wants to be in the office more (or simply can't work from their homes) to be in as many days as they want. And there are actually national guidelines on who counts as "clinically vulnerable", based on who was advised to shield in earlier stages of the pandemic - in our case, one person who finished cancer treatment last year and one with a blood clotting disorder. I had someone else who lives with elderly parents but as far as I know none of them have particular vulnerabilities, so I've told them that they do need to come in but we can move them to a single office if that would help.