The MedicPortal list of work experience requirements has been produced by someone just looking at all the medical school web sites and summarizing what's on them. Most medical schools are updating their advice in preparation for open days; what's on the web sites might lag slightly behind. I would guess that TMP will update their resources as time goes on: they are usually pretty responsive.
Certainly my own medical school doesn't expect experience in healthcare settings. In fact, it's often a disadvantage to have this as it tends to involve passive observation, which isn't really of any value for demonstrating suitability. It can be valuable to students to help them decide whether it's actually a career they want to pursue, but it doesn't tell medical schools anything about them as future doctors.
Everyone is in the same boat regarding access to caring experience, so of course what's expected will be different. I would be encouraging prospective medics to be thinking about what kinds of things they can do that show they're committed to NHS values. The most obvious things are getting involved in their local communities - e.g. delivering groceries to shielding/self-isolating people, working with food banks, etc. - and supporting charities like hospices, which are mostly in imminent danger of bankruptcy. An applicant who has done some online entertainment events for people who are trapped at home, and in the process raised money for an essential charity, is going to be far more impressive than one who has fruitlessly tried to get experience in a hospital/GP surgery.
Given that schools are going to be closed throughout the summer, there might well be a need for sixth-form students to contribute to efforts to support younger pupils while they have no regular contact with schools: buddying schemes, etc. This is the kind of thing I would expect a prospective medical student to be volunteering for pretty much automatically. I would be very disappointed in someone who wants to go to medical school but doesn't actively seek this kind of voluntary role.
Remember, also, that many medical schools don't have any work experience requirements. There are things that students need to be able to talk about at interview but there are lots of different ways for them to find out about those things.
Regarding virual interviews, I think most medical schools are planning for these in case they become necessary. We'd all prefer to do interviews face to face but, if we're not allowed to have those numbers of students in buildings and students can't use public transport, we're likely to be forced into doing them online. Again, there will be announcements soon.