Different schools, different departments, different rules. For example, the computer department of the University of Liverpool needs to sign in for every class. If the final attendance rate is lower than a certain number, you will be informed by email. Please pay attention to or explain to your personal tutor the reasons for not attending classes and whether there are any difficulties. . But I won't report directly to the embassy what will affect the visa without informing you. Britain is very human. It is absolutely impossible to cancel the visa without saying a word! If a student really has an accident and can't go to school, all these are possible. If you want to do business in Liverpool, you don't need to sign in at all Imperial College doesn't attend work at all, so whether you go or not, you just have to pass the exam at last. Other schools don't know, but they really won't take you away suddenly. Even if you don't go to school, you can always pay attention to the email and know what the school has notified at any time. (ps: I am studying in the UK now)