Our first year lectures have almost 500 students. The technology cannot cope with live streaming to that big a number. Some departments have tried having seminars with a mixture of people attending in person and others remotely and it hasn't worked. People can't hear each other, the remote people don't join in and the in-person students forget to speak to them and talk over them.
We have been doing in-person seminars for those who can attend and on-line ones for those who can't. Each student has been getting 2/3rds of their teaching face-to-face unless the government prevents it. What was previously a one hour seminar is now three one hour seminars due to the limits on room capacity and having to provide an additional on-line seminar. The first seminar taught by our staff is at 7am, the last ends at 7pm.
As well a simply working longer hours, like many other departments we have made this extra time by essentially tanking our research, and our research income. This is not only bad for our staff, but as a previously rich department we used our research income to subsidise extra teaching, equipment and events for UK students whose fees don't cover these things. Next year, they will have less. Still way above what we are required to offer them, but still less.
We also don't know who will be teaching them. To compensate for the loss of research income across the university, loss of income from giving students a rent waiver if they don't use their accommodation and the additional costs of making the campus safe for face-to-face teaching, the university is looking to lose up to 10% of its staff. We have just entered the second round of voluntary redundancies of the pandemic.
I don't know if we would have done things differently if we had known how long this would go on for and how much it would cost us, but I can understand why other universities have not taken this route.