English universities face tiered restrictions in Covid lockdowns

We are told to provide some online teaching, but a minimum of face-to-face teaching too. Lots of staff are trying their best to find suitable teaching spaces for all students and timetable shifts because classes will have to be split to redude student numbers in the teaching rooms. In my university town in England this week we are seeing a rise in numbers of students moving in and meeting in large groups (more than 6 people), picnicking around the town, going out and about... No masks, no safe distancing. I wonder how the rules and guidelines outlined above can be enforced. Who is going to patrol the dorms and student lettings to check they don't meet in large numbers? Or check that they isolate if their housemate has symptoms? Good luck to us all.