I think the point about social distance on public transport is one reason why as many companies as possible should continue with WFH for those people who are proving it's working AND are happy to continue with it.
A lot of the kids will eventually go back to school, PROBABLY those who are older but not in critical education years (like the year 7 and 8s) may be the last to go back. I say probably as I'm not one of the planning teams in a school so I've no idea yet. But it would make sense to get the younger kids back - that frees up the most parents.
As I say DS, who is year 8, is more than capable of getting on with work - DH and I barely know he's home at the moment TBH (I know we're lucky). DH could easily carry on WFH even with DS home for a few months.
Otherwise DH is flying every week. That's one extra body on the tube then the plane. And it's not necessary as he is, as I said, experienced working from home, finds it doable (not as easy as popping upstairs to see the boss but his equivalent of zoom is working very well - they had a huge global meeting on it yesterday with no wifi drop out).
His, and others, working from home would mean the public transport is less full which can only be a good thing for the people who have no choice but to leave the home to work - like me!