I have a member of staff who works within the same building as the rest of the company. This person has of late taken to almost always closing his computer screen whenever anyone approaches them. If it is left open then there is valid work being done. The immediate closing seemed suspicious to me so after they left one day I viewed their browser history to find that on 2 occasions when there were no management on site they spent the whole day looking for holidays, Christmas presents and other items not work related. There are several hundred page views per day. There are lots of things this person could have been working on during this time. Is this gross misconduct.