I think bus companies and train companies in general took the same action, but they are also reporting an 80% drop in passengers.
London has to have train drivers, and most stations aren't as safe as a fairly new system.
Everyone else in low and middle income bracket is just getting screwed.
While our hospitals have not been overloaded yet, the government has already been calling in any extra potential personnel to help with the upcoming strain. Like recently retired doctors, medical students, etc.
Seat reservations are compulsory on longer-distance trains (to prevent overcrowding), although I doubt they're busy anyway.
This image is from six days ago, I’d usually expect to see ~25 people in this space https://imgur.com/lUC9hO4