Unfortunately I have had to make all my staff redundant due to a complete loss of business due to covid. One long time employment is being difficult about returning his company phone. He is saying that he doesn't think he legally has to do this! He wants us to provide evidence this has to happen. I have never had this issue before so am shocked. There is no specific detail about equipment in his contract. The phone is owned by the company and no personal use is expected although we do not penalise for it unless it incurs a significant cost. Are there any resources I can provide to demonstrate the equipment must legally be returned?