Visiting students are defined as students who attend the University and receive advice and support through supervision and use of research facilities. These students will receive no credit or qualification from the University.
Visiting students typically come to Warwick for a period of up to 12 months and currently (AYs 2020-23) are not liable for any fees. They can be based at any HEI anywhere (including UK).
There are no limits to the number of visiting students a department can have at any time.