I work in homecare on 0 hour contract. At the moment I'm not working until children are back to school. My work have just informed me I have to take a weekly covid test as it's the law regardless of any symptoms. Is this inforcable? I'm not working but they say it's law (mentioned numerous times over the phone) I have to self test. No instructions on how to do it. I feel pressured into doing a test which is not pleasant to do. Can my work do this?