Bit of a mess, but at least at the moment they've limited the days to Thursday and Fridays... hopefully it stays that way as I've booked via them to get from Edinburgh to London at the end of my trip. If you're coming over and have booked with them, you'll need to book again with someone else, and even that is sketchy with increased demand.
Adding the fair amount of tube line shutdowns and station closures, and I'm very glad I'm staying in central locations!